1

LHCb status and perspectives

Yu Guz IHEP Protvino

on behalf of the LHCb collaboration

1 LHCb detector status

2 Key measurements

3 LHCb upgrade issues

4 Conclusions

2

LHCb A Large Hadron Collider experiment for PrecisionLHCb A Large Hadron Collider experiment for Precision Measurements of CP Violation and Rare Decays Measurements of CP Violation and Rare Decays

gt700 gt700 physicists physicists 50 institutes 15 50 institutes 15 countriescountries

ATLASATLAS

ALICEALICECMSCMS

3

LHCb experiment

Pythia

100μb

230μb

η of B-hadronP

T o

f B

-ha

dro

n

bb angular distribution

-

b

b

b

b

B hadron signature particles with high PT (few GeV) displaced vertex (~1cm from primary vertex)

Reconstruction of B decays is based on bull good mass resolutionbull excellent particle id to reject backgroundbull good proper time resolution to resolve B0

S oscillations

LHC radics=14 TeV σinelastic~80mb σ(bb)~05mbThe bb production is sharply peaked forward-backward

LHCb is a single arm detector 19lt|η|lt49

5

is ready to take data

VELO

Muon det Calorsquos RICH-2 MagnetOT+IT RICH-1

The LHCb detector

installation is complete

a beam-gas event 100908

6

ε(KK) 97ε(πK) 5

LHCb detector performanceDetailed Geant4 simulation

bull proper time resolution ~ 40 fs

bull effective mass resolution ~ 20 MeV

bull good Kπ separation up to ~60 GeV proper time resolution ~ 40 fs

BsDs(KKπ)K

Eff mass resolution ~ 20 MeV

7

LHCb operation at LHC

Bunch crossing frequency 40 MHz

Design LHC luminosity 1034 cm-2s-

1

Nominal LHCb luminosity 2∙1032 cm-2s-1

(appropriate focusing of the beam)

Expect ge2 fb-1 year

Inelastic pp interactions σ ~ 80 mb

8

LHCb trigger

L0 HLT and L0timesHLT efficiency

HLT rate

Event type Physics

200 Hz Exclusive B decay candidates

B (core programme)

600 Hz High mass dimuons J bJX (lifetime unbiased)

300 Hz D candidates Charm (mixing amp CPV)

900 Hz Inclusive b (eg b)

B (data mining)

L0 Trigger hardware 4 μsec latency

High ET (hgt35 GeV e γgt25 GeV μ μμgt1GeV)

Pileup VETO

Output rate ~1 MHz

High Level Trigger software two stages HLT1 and HLT2

HLT1 confirm L0 objects with T VELO optionally IP cuts hellipoutput ~ 30 kHz

HLT2 full reconstruction exclusive and inclusive candidates

Output 2 kHz storage event size ~35 kB

K+

Qvertex QJet

PV

e--

Bs0signal

D

KK

K-B0opposite

Opposite sidendash High Pt leptonsndash Kplusmn from b rarr c rarr

s ndash Vertex chargendash Jet charge

Same sidendash Fragmentation Kplusmn accompanying

Bs

ndash πplusmn from B rarr B() πplusmn

~95

35(K)

10

23

07

15

Bs

~ 51

07 (p)

10

21

04

11

Bd

Same side pK

Combined (Neural Net)

Jet Vertex Charge

Kaon oppside

Electron

Muon

Tag

Effective tagging efficiency

εD2= ε(1-2ω)2 ε tagging efficiency ω wrong tag fraction

Flavour tagging

10

LHCb key measurements

CP-violation

φS

γ in trees

γ in loops

rare B decays

BS μμ

B K μμ

photon polarization in radiative penguin decays

charm physics

Mixing

CP violation

other

τ 3μ (analysis is ongoing)

11

2008 (beginning of 2009) Lumi ~1031 cm-2s-1 10 TeV

~108 sample of minimum bias L0+proto-HLT trigger collect ~ 5 pb-1

Calibration alignment minimum bias physics charmonium production2009 Lumi 2 1032 cm-2s-1 14 TeV

L0 + HLT collect ~ 051 fb-1

B Physics calibration CP (sin2β Δms ) key measurements (βs Bsμμ hellip)2010-2013 Luminosity 2-5 1032 cm-2s-1

collect total of ~10 fb-1

Full physics program Phase I

2013+ Upgrade proposed to run at 2 1033 cm-2s-1

Collect ~ 100 fb-1

Physics program

12

CP violation

13

Key measurement for 2009

φS is small in SM φS =-2βS =-2λ2η asymp -0036

sensitive probe for New Physics φS = φSSM + φS

NP

Measure from time dependent CP asymmetry in bccs

(BS Jψ φ BS Jψ η(ηrsquo) BS ηCφ BS DSDS hellip)

ldquogolden moderdquo BS Jψ φ high BR (~130k per 2 fb-1)

φS measurement

Tevatron resultsD0 s= 057 + 024

-030 with with 28 fb-1

CDFs = [032282] 68CL with 135 fb-1

14

φS measurement

The BSM effect in φS can be discovered or excluded with 20082009 LHCb data

Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even

Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics

15

angle γ

Measured values90 CL

Fit results90 CL

α 875 +311-102

907 + 168 - 54

β 215 +20-19 217 + 20 - 18

γ 768 +527-504

676 + 53 - 159

Least constrained by direct measurementsKey measurement of LHCb

Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics

16

3

2

1From tree amplitudes BS DSKTime dependent CP asymmetry

From tree amplitudes BplusmnDKplusmn B0DK

ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-

GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0

Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-

From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements

angle γ

17

s

s

b

c

u

s

Bs0

Ds

K

Kndash

s

s

b

u

c

s

Bs0

Ds

bull interference between tree level decays via mixingbull insensitive to New Physics

bull Measures + 2s (s from Bs J)

bull Main background Bs Ds

bull 10 times higher branching ratio bull suppressed using PID by RICH

Channel Yield 2 fb-1 BS (90 CL)

BSDSK 62 k [008-04]

BSDS 140 k [008-03]

sif eie2

sif e

KDs

KDs)(0 tBs

)(0 tBs

)0(0sB

γ from BSDSK

18

5 years dataBsrarr Ds

-

Bsrarr Ds-K+

ms = 20)

BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs

Sensitivity at 2 fb-1

s(γ+φs) = 9ondash12o

s(ms) = 0007 ps-1

γ from BSDSK

19

ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K

Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD

Kπ~006)

Colour allowed

Double Cabbibo suppressed

Colour suppressed

Cabbibo favoured

Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects

γ from BDK

20

favoured

colour suppressed

Channel Yield (2 fb-

1)BS

B rarr D(hh) K 78 k 18

B rarr D(K) K Favoured 56 k 06

B rarr D(K) K Suppressed 071k 2

B rarr D(K3) K Favoured 62k 07

B rarr D(K3) K Suppressed 08k 2

() = 5o to 13o

depending on strong phases

Also under studyBplusmn rarr DKplusmn with D rarr Ks

Bplusmn rarr DKplusmn with D rarr KK

B0 rarr DK0 with D rarr KK K

Bplusmn rarr DKplusmn with D rarr KK K(high background)

Overall expect precision of() = 5o with 2 fb-1 of data

Dalitz analyses

()

γ from BDK

24

Rare B decays

25

BSμμ

Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9

Sensitive to NP models with S or P coupling

MSSM Br ~ tan6βMA4

bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity

(SM branching ratio) bull 01 fb-1 BR lt 10-8

bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation

26

Bsφγ

b (L) + (msmb) (R)

In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur

Measuring time-dependent CP asymmetry is a probe for NP

2sinh

2cosh

sincos

)()(

)()()(

tA

tmtAmtA

BB

BBtA mixdir

SS

SSCP

In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1

Channel Yield (2 fb-1)

BS

Bsrarr 11k lt055

Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)

27

BdKμμ

bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now

Channel Yield (2 fb-1) BG (2 fb-1)

BsrarrK+ ndash 7200+-2200 (BR)

1770+-310

Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0

SM(C7C9)=439(+038-035) GeV2

sensitive to NP contribution

s = (m)2 [GeV2]

2 fb-1

A fb(s

) s0

(s0) = 05 GeV2

28

Charm amp tau

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

2

LHCb A Large Hadron Collider experiment for PrecisionLHCb A Large Hadron Collider experiment for Precision Measurements of CP Violation and Rare Decays Measurements of CP Violation and Rare Decays

gt700 gt700 physicists physicists 50 institutes 15 50 institutes 15 countriescountries

ATLASATLAS

ALICEALICECMSCMS

3

LHCb experiment

Pythia

100μb

230μb

η of B-hadronP

T o

f B

-ha

dro

n

bb angular distribution

-

b

b

b

b

B hadron signature particles with high PT (few GeV) displaced vertex (~1cm from primary vertex)

Reconstruction of B decays is based on bull good mass resolutionbull excellent particle id to reject backgroundbull good proper time resolution to resolve B0

S oscillations

LHC radics=14 TeV σinelastic~80mb σ(bb)~05mbThe bb production is sharply peaked forward-backward

LHCb is a single arm detector 19lt|η|lt49

5

is ready to take data

VELO

Muon det Calorsquos RICH-2 MagnetOT+IT RICH-1

The LHCb detector

installation is complete

a beam-gas event 100908

6

ε(KK) 97ε(πK) 5

LHCb detector performanceDetailed Geant4 simulation

bull proper time resolution ~ 40 fs

bull effective mass resolution ~ 20 MeV

bull good Kπ separation up to ~60 GeV proper time resolution ~ 40 fs

BsDs(KKπ)K

Eff mass resolution ~ 20 MeV

7

LHCb operation at LHC

Bunch crossing frequency 40 MHz

Design LHC luminosity 1034 cm-2s-

1

Nominal LHCb luminosity 2∙1032 cm-2s-1

(appropriate focusing of the beam)

Expect ge2 fb-1 year

Inelastic pp interactions σ ~ 80 mb

8

LHCb trigger

L0 HLT and L0timesHLT efficiency

HLT rate

Event type Physics

200 Hz Exclusive B decay candidates

B (core programme)

600 Hz High mass dimuons J bJX (lifetime unbiased)

300 Hz D candidates Charm (mixing amp CPV)

900 Hz Inclusive b (eg b)

B (data mining)

L0 Trigger hardware 4 μsec latency

High ET (hgt35 GeV e γgt25 GeV μ μμgt1GeV)

Pileup VETO

Output rate ~1 MHz

High Level Trigger software two stages HLT1 and HLT2

HLT1 confirm L0 objects with T VELO optionally IP cuts hellipoutput ~ 30 kHz

HLT2 full reconstruction exclusive and inclusive candidates

Output 2 kHz storage event size ~35 kB

K+

Qvertex QJet

PV

e--

Bs0signal

D

KK

K-B0opposite

Opposite sidendash High Pt leptonsndash Kplusmn from b rarr c rarr

s ndash Vertex chargendash Jet charge

Same sidendash Fragmentation Kplusmn accompanying

Bs

ndash πplusmn from B rarr B() πplusmn

~95

35(K)

10

23

07

15

Bs

~ 51

07 (p)

10

21

04

11

Bd

Same side pK

Combined (Neural Net)

Jet Vertex Charge

Kaon oppside

Electron

Muon

Tag

Effective tagging efficiency

εD2= ε(1-2ω)2 ε tagging efficiency ω wrong tag fraction

Flavour tagging

10

LHCb key measurements

CP-violation

φS

γ in trees

γ in loops

rare B decays

BS μμ

B K μμ

photon polarization in radiative penguin decays

charm physics

Mixing

CP violation

other

τ 3μ (analysis is ongoing)

11

2008 (beginning of 2009) Lumi ~1031 cm-2s-1 10 TeV

~108 sample of minimum bias L0+proto-HLT trigger collect ~ 5 pb-1

Calibration alignment minimum bias physics charmonium production2009 Lumi 2 1032 cm-2s-1 14 TeV

L0 + HLT collect ~ 051 fb-1

B Physics calibration CP (sin2β Δms ) key measurements (βs Bsμμ hellip)2010-2013 Luminosity 2-5 1032 cm-2s-1

collect total of ~10 fb-1

Full physics program Phase I

2013+ Upgrade proposed to run at 2 1033 cm-2s-1

Collect ~ 100 fb-1

Physics program

12

CP violation

13

Key measurement for 2009

φS is small in SM φS =-2βS =-2λ2η asymp -0036

sensitive probe for New Physics φS = φSSM + φS

NP

Measure from time dependent CP asymmetry in bccs

(BS Jψ φ BS Jψ η(ηrsquo) BS ηCφ BS DSDS hellip)

ldquogolden moderdquo BS Jψ φ high BR (~130k per 2 fb-1)

φS measurement

Tevatron resultsD0 s= 057 + 024

-030 with with 28 fb-1

CDFs = [032282] 68CL with 135 fb-1

14

φS measurement

The BSM effect in φS can be discovered or excluded with 20082009 LHCb data

Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even

Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics

15

angle γ

Measured values90 CL

Fit results90 CL

α 875 +311-102

907 + 168 - 54

β 215 +20-19 217 + 20 - 18

γ 768 +527-504

676 + 53 - 159

Least constrained by direct measurementsKey measurement of LHCb

Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics

16

3

2

1From tree amplitudes BS DSKTime dependent CP asymmetry

From tree amplitudes BplusmnDKplusmn B0DK

ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-

GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0

Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-

From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements

angle γ

17

s

s

b

c

u

s

Bs0

Ds

K

Kndash

s

s

b

u

c

s

Bs0

Ds

bull interference between tree level decays via mixingbull insensitive to New Physics

bull Measures + 2s (s from Bs J)

bull Main background Bs Ds

bull 10 times higher branching ratio bull suppressed using PID by RICH

Channel Yield 2 fb-1 BS (90 CL)

BSDSK 62 k [008-04]

BSDS 140 k [008-03]

sif eie2

sif e

KDs

KDs)(0 tBs

)(0 tBs

)0(0sB

γ from BSDSK

18

5 years dataBsrarr Ds

-

Bsrarr Ds-K+

ms = 20)

BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs

Sensitivity at 2 fb-1

s(γ+φs) = 9ondash12o

s(ms) = 0007 ps-1

γ from BSDSK

19

ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K

Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD

Kπ~006)

Colour allowed

Double Cabbibo suppressed

Colour suppressed

Cabbibo favoured

Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects

γ from BDK

20

favoured

colour suppressed

Channel Yield (2 fb-

1)BS

B rarr D(hh) K 78 k 18

B rarr D(K) K Favoured 56 k 06

B rarr D(K) K Suppressed 071k 2

B rarr D(K3) K Favoured 62k 07

B rarr D(K3) K Suppressed 08k 2

() = 5o to 13o

depending on strong phases

Also under studyBplusmn rarr DKplusmn with D rarr Ks

Bplusmn rarr DKplusmn with D rarr KK

B0 rarr DK0 with D rarr KK K

Bplusmn rarr DKplusmn with D rarr KK K(high background)

Overall expect precision of() = 5o with 2 fb-1 of data

Dalitz analyses

()

γ from BDK

24

Rare B decays

25

BSμμ

Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9

Sensitive to NP models with S or P coupling

MSSM Br ~ tan6βMA4

bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity

(SM branching ratio) bull 01 fb-1 BR lt 10-8

bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation

26

Bsφγ

b (L) + (msmb) (R)

In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur

Measuring time-dependent CP asymmetry is a probe for NP

2sinh

2cosh

sincos

)()(

)()()(

tA

tmtAmtA

BB

BBtA mixdir

SS

SSCP

In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1

Channel Yield (2 fb-1)

BS

Bsrarr 11k lt055

Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)

27

BdKμμ

bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now

Channel Yield (2 fb-1) BG (2 fb-1)

BsrarrK+ ndash 7200+-2200 (BR)

1770+-310

Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0

SM(C7C9)=439(+038-035) GeV2

sensitive to NP contribution

s = (m)2 [GeV2]

2 fb-1

A fb(s

) s0

(s0) = 05 GeV2

28

Charm amp tau

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

3

LHCb experiment

Pythia

100μb

230μb

η of B-hadronP

T o

f B

-ha

dro

n

bb angular distribution

-

b

b

b

b

B hadron signature particles with high PT (few GeV) displaced vertex (~1cm from primary vertex)

Reconstruction of B decays is based on bull good mass resolutionbull excellent particle id to reject backgroundbull good proper time resolution to resolve B0

S oscillations

LHC radics=14 TeV σinelastic~80mb σ(bb)~05mbThe bb production is sharply peaked forward-backward

LHCb is a single arm detector 19lt|η|lt49

5

is ready to take data

VELO

Muon det Calorsquos RICH-2 MagnetOT+IT RICH-1

The LHCb detector

installation is complete

a beam-gas event 100908

6

ε(KK) 97ε(πK) 5

LHCb detector performanceDetailed Geant4 simulation

bull proper time resolution ~ 40 fs

bull effective mass resolution ~ 20 MeV

bull good Kπ separation up to ~60 GeV proper time resolution ~ 40 fs

BsDs(KKπ)K

Eff mass resolution ~ 20 MeV

7

LHCb operation at LHC

Bunch crossing frequency 40 MHz

Design LHC luminosity 1034 cm-2s-

1

Nominal LHCb luminosity 2∙1032 cm-2s-1

(appropriate focusing of the beam)

Expect ge2 fb-1 year

Inelastic pp interactions σ ~ 80 mb

8

LHCb trigger

L0 HLT and L0timesHLT efficiency

HLT rate

Event type Physics

200 Hz Exclusive B decay candidates

B (core programme)

600 Hz High mass dimuons J bJX (lifetime unbiased)

300 Hz D candidates Charm (mixing amp CPV)

900 Hz Inclusive b (eg b)

B (data mining)

L0 Trigger hardware 4 μsec latency

High ET (hgt35 GeV e γgt25 GeV μ μμgt1GeV)

Pileup VETO

Output rate ~1 MHz

High Level Trigger software two stages HLT1 and HLT2

HLT1 confirm L0 objects with T VELO optionally IP cuts hellipoutput ~ 30 kHz

HLT2 full reconstruction exclusive and inclusive candidates

Output 2 kHz storage event size ~35 kB

K+

Qvertex QJet

PV

e--

Bs0signal

D

KK

K-B0opposite

Opposite sidendash High Pt leptonsndash Kplusmn from b rarr c rarr

s ndash Vertex chargendash Jet charge

Same sidendash Fragmentation Kplusmn accompanying

Bs

ndash πplusmn from B rarr B() πplusmn

~95

35(K)

10

23

07

15

Bs

~ 51

07 (p)

10

21

04

11

Bd

Same side pK

Combined (Neural Net)

Jet Vertex Charge

Kaon oppside

Electron

Muon

Tag

Effective tagging efficiency

εD2= ε(1-2ω)2 ε tagging efficiency ω wrong tag fraction

Flavour tagging

10

LHCb key measurements

CP-violation

φS

γ in trees

γ in loops

rare B decays

BS μμ

B K μμ

photon polarization in radiative penguin decays

charm physics

Mixing

CP violation

other

τ 3μ (analysis is ongoing)

11

2008 (beginning of 2009) Lumi ~1031 cm-2s-1 10 TeV

~108 sample of minimum bias L0+proto-HLT trigger collect ~ 5 pb-1

Calibration alignment minimum bias physics charmonium production2009 Lumi 2 1032 cm-2s-1 14 TeV

L0 + HLT collect ~ 051 fb-1

B Physics calibration CP (sin2β Δms ) key measurements (βs Bsμμ hellip)2010-2013 Luminosity 2-5 1032 cm-2s-1

collect total of ~10 fb-1

Full physics program Phase I

2013+ Upgrade proposed to run at 2 1033 cm-2s-1

Collect ~ 100 fb-1

Physics program

12

CP violation

13

Key measurement for 2009

φS is small in SM φS =-2βS =-2λ2η asymp -0036

sensitive probe for New Physics φS = φSSM + φS

NP

Measure from time dependent CP asymmetry in bccs

(BS Jψ φ BS Jψ η(ηrsquo) BS ηCφ BS DSDS hellip)

ldquogolden moderdquo BS Jψ φ high BR (~130k per 2 fb-1)

φS measurement

Tevatron resultsD0 s= 057 + 024

-030 with with 28 fb-1

CDFs = [032282] 68CL with 135 fb-1

14

φS measurement

The BSM effect in φS can be discovered or excluded with 20082009 LHCb data

Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even

Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics

15

angle γ

Measured values90 CL

Fit results90 CL

α 875 +311-102

907 + 168 - 54

β 215 +20-19 217 + 20 - 18

γ 768 +527-504

676 + 53 - 159

Least constrained by direct measurementsKey measurement of LHCb

Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics

16

3

2

1From tree amplitudes BS DSKTime dependent CP asymmetry

From tree amplitudes BplusmnDKplusmn B0DK

ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-

GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0

Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-

From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements

angle γ

17

s

s

b

c

u

s

Bs0

Ds

K

Kndash

s

s

b

u

c

s

Bs0

Ds

bull interference between tree level decays via mixingbull insensitive to New Physics

bull Measures + 2s (s from Bs J)

bull Main background Bs Ds

bull 10 times higher branching ratio bull suppressed using PID by RICH

Channel Yield 2 fb-1 BS (90 CL)

BSDSK 62 k [008-04]

BSDS 140 k [008-03]

sif eie2

sif e

KDs

KDs)(0 tBs

)(0 tBs

)0(0sB

γ from BSDSK

18

5 years dataBsrarr Ds

-

Bsrarr Ds-K+

ms = 20)

BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs

Sensitivity at 2 fb-1

s(γ+φs) = 9ondash12o

s(ms) = 0007 ps-1

γ from BSDSK

19

ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K

Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD

Kπ~006)

Colour allowed

Double Cabbibo suppressed

Colour suppressed

Cabbibo favoured

Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects

γ from BDK

20

favoured

colour suppressed

Channel Yield (2 fb-

1)BS

B rarr D(hh) K 78 k 18

B rarr D(K) K Favoured 56 k 06

B rarr D(K) K Suppressed 071k 2

B rarr D(K3) K Favoured 62k 07

B rarr D(K3) K Suppressed 08k 2

() = 5o to 13o

depending on strong phases

Also under studyBplusmn rarr DKplusmn with D rarr Ks

Bplusmn rarr DKplusmn with D rarr KK

B0 rarr DK0 with D rarr KK K

Bplusmn rarr DKplusmn with D rarr KK K(high background)

Overall expect precision of() = 5o with 2 fb-1 of data

Dalitz analyses

()

γ from BDK

24

Rare B decays

25

BSμμ

Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9

Sensitive to NP models with S or P coupling

MSSM Br ~ tan6βMA4

bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity

(SM branching ratio) bull 01 fb-1 BR lt 10-8

bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation

26

Bsφγ

b (L) + (msmb) (R)

In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur

Measuring time-dependent CP asymmetry is a probe for NP

2sinh

2cosh

sincos

)()(

)()()(

tA

tmtAmtA

BB

BBtA mixdir

SS

SSCP

In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1

Channel Yield (2 fb-1)

BS

Bsrarr 11k lt055

Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)

27

BdKμμ

bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now

Channel Yield (2 fb-1) BG (2 fb-1)

BsrarrK+ ndash 7200+-2200 (BR)

1770+-310

Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0

SM(C7C9)=439(+038-035) GeV2

sensitive to NP contribution

s = (m)2 [GeV2]

2 fb-1

A fb(s

) s0

(s0) = 05 GeV2

28

Charm amp tau

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

5

is ready to take data

VELO

Muon det Calorsquos RICH-2 MagnetOT+IT RICH-1

The LHCb detector

installation is complete

a beam-gas event 100908

6

ε(KK) 97ε(πK) 5

LHCb detector performanceDetailed Geant4 simulation

bull proper time resolution ~ 40 fs

bull effective mass resolution ~ 20 MeV

bull good Kπ separation up to ~60 GeV proper time resolution ~ 40 fs

BsDs(KKπ)K

Eff mass resolution ~ 20 MeV

7

LHCb operation at LHC

Bunch crossing frequency 40 MHz

Design LHC luminosity 1034 cm-2s-

1

Nominal LHCb luminosity 2∙1032 cm-2s-1

(appropriate focusing of the beam)

Expect ge2 fb-1 year

Inelastic pp interactions σ ~ 80 mb

8

LHCb trigger

L0 HLT and L0timesHLT efficiency

HLT rate

Event type Physics

200 Hz Exclusive B decay candidates

B (core programme)

600 Hz High mass dimuons J bJX (lifetime unbiased)

300 Hz D candidates Charm (mixing amp CPV)

900 Hz Inclusive b (eg b)

B (data mining)

L0 Trigger hardware 4 μsec latency

High ET (hgt35 GeV e γgt25 GeV μ μμgt1GeV)

Pileup VETO

Output rate ~1 MHz

High Level Trigger software two stages HLT1 and HLT2

HLT1 confirm L0 objects with T VELO optionally IP cuts hellipoutput ~ 30 kHz

HLT2 full reconstruction exclusive and inclusive candidates

Output 2 kHz storage event size ~35 kB

K+

Qvertex QJet

PV

e--

Bs0signal

D

KK

K-B0opposite

Opposite sidendash High Pt leptonsndash Kplusmn from b rarr c rarr

s ndash Vertex chargendash Jet charge

Same sidendash Fragmentation Kplusmn accompanying

Bs

ndash πplusmn from B rarr B() πplusmn

~95

35(K)

10

23

07

15

Bs

~ 51

07 (p)

10

21

04

11

Bd

Same side pK

Combined (Neural Net)

Jet Vertex Charge

Kaon oppside

Electron

Muon

Tag

Effective tagging efficiency

εD2= ε(1-2ω)2 ε tagging efficiency ω wrong tag fraction

Flavour tagging

10

LHCb key measurements

CP-violation

φS

γ in trees

γ in loops

rare B decays

BS μμ

B K μμ

photon polarization in radiative penguin decays

charm physics

Mixing

CP violation

other

τ 3μ (analysis is ongoing)

11

2008 (beginning of 2009) Lumi ~1031 cm-2s-1 10 TeV

~108 sample of minimum bias L0+proto-HLT trigger collect ~ 5 pb-1

Calibration alignment minimum bias physics charmonium production2009 Lumi 2 1032 cm-2s-1 14 TeV

L0 + HLT collect ~ 051 fb-1

B Physics calibration CP (sin2β Δms ) key measurements (βs Bsμμ hellip)2010-2013 Luminosity 2-5 1032 cm-2s-1

collect total of ~10 fb-1

Full physics program Phase I

2013+ Upgrade proposed to run at 2 1033 cm-2s-1

Collect ~ 100 fb-1

Physics program

12

CP violation

13

Key measurement for 2009

φS is small in SM φS =-2βS =-2λ2η asymp -0036

sensitive probe for New Physics φS = φSSM + φS

NP

Measure from time dependent CP asymmetry in bccs

(BS Jψ φ BS Jψ η(ηrsquo) BS ηCφ BS DSDS hellip)

ldquogolden moderdquo BS Jψ φ high BR (~130k per 2 fb-1)

φS measurement

Tevatron resultsD0 s= 057 + 024

-030 with with 28 fb-1

CDFs = [032282] 68CL with 135 fb-1

14

φS measurement

The BSM effect in φS can be discovered or excluded with 20082009 LHCb data

Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even

Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics

15

angle γ

Measured values90 CL

Fit results90 CL

α 875 +311-102

907 + 168 - 54

β 215 +20-19 217 + 20 - 18

γ 768 +527-504

676 + 53 - 159

Least constrained by direct measurementsKey measurement of LHCb

Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics

16

3

2

1From tree amplitudes BS DSKTime dependent CP asymmetry

From tree amplitudes BplusmnDKplusmn B0DK

ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-

GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0

Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-

From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements

angle γ

17

s

s

b

c

u

s

Bs0

Ds

K

Kndash

s

s

b

u

c

s

Bs0

Ds

bull interference between tree level decays via mixingbull insensitive to New Physics

bull Measures + 2s (s from Bs J)

bull Main background Bs Ds

bull 10 times higher branching ratio bull suppressed using PID by RICH

Channel Yield 2 fb-1 BS (90 CL)

BSDSK 62 k [008-04]

BSDS 140 k [008-03]

sif eie2

sif e

KDs

KDs)(0 tBs

)(0 tBs

)0(0sB

γ from BSDSK

18

5 years dataBsrarr Ds

-

Bsrarr Ds-K+

ms = 20)

BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs

Sensitivity at 2 fb-1

s(γ+φs) = 9ondash12o

s(ms) = 0007 ps-1

γ from BSDSK

19

ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K

Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD

Kπ~006)

Colour allowed

Double Cabbibo suppressed

Colour suppressed

Cabbibo favoured

Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects

γ from BDK

20

favoured

colour suppressed

Channel Yield (2 fb-

1)BS

B rarr D(hh) K 78 k 18

B rarr D(K) K Favoured 56 k 06

B rarr D(K) K Suppressed 071k 2

B rarr D(K3) K Favoured 62k 07

B rarr D(K3) K Suppressed 08k 2

() = 5o to 13o

depending on strong phases

Also under studyBplusmn rarr DKplusmn with D rarr Ks

Bplusmn rarr DKplusmn with D rarr KK

B0 rarr DK0 with D rarr KK K

Bplusmn rarr DKplusmn with D rarr KK K(high background)

Overall expect precision of() = 5o with 2 fb-1 of data

Dalitz analyses

()

γ from BDK

24

Rare B decays

25

BSμμ

Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9

Sensitive to NP models with S or P coupling

MSSM Br ~ tan6βMA4

bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity

(SM branching ratio) bull 01 fb-1 BR lt 10-8

bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation

26

Bsφγ

b (L) + (msmb) (R)

In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur

Measuring time-dependent CP asymmetry is a probe for NP

2sinh

2cosh

sincos

)()(

)()()(

tA

tmtAmtA

BB

BBtA mixdir

SS

SSCP

In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1

Channel Yield (2 fb-1)

BS

Bsrarr 11k lt055

Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)

27

BdKμμ

bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now

Channel Yield (2 fb-1) BG (2 fb-1)

BsrarrK+ ndash 7200+-2200 (BR)

1770+-310

Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0

SM(C7C9)=439(+038-035) GeV2

sensitive to NP contribution

s = (m)2 [GeV2]

2 fb-1

A fb(s

) s0

(s0) = 05 GeV2

28

Charm amp tau

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

6

ε(KK) 97ε(πK) 5

LHCb detector performanceDetailed Geant4 simulation

bull proper time resolution ~ 40 fs

bull effective mass resolution ~ 20 MeV

bull good Kπ separation up to ~60 GeV proper time resolution ~ 40 fs

BsDs(KKπ)K

Eff mass resolution ~ 20 MeV

7

LHCb operation at LHC

Bunch crossing frequency 40 MHz

Design LHC luminosity 1034 cm-2s-

1

Nominal LHCb luminosity 2∙1032 cm-2s-1

(appropriate focusing of the beam)

Expect ge2 fb-1 year

Inelastic pp interactions σ ~ 80 mb

8

LHCb trigger

L0 HLT and L0timesHLT efficiency

HLT rate

Event type Physics

200 Hz Exclusive B decay candidates

B (core programme)

600 Hz High mass dimuons J bJX (lifetime unbiased)

300 Hz D candidates Charm (mixing amp CPV)

900 Hz Inclusive b (eg b)

B (data mining)

L0 Trigger hardware 4 μsec latency

High ET (hgt35 GeV e γgt25 GeV μ μμgt1GeV)

Pileup VETO

Output rate ~1 MHz

High Level Trigger software two stages HLT1 and HLT2

HLT1 confirm L0 objects with T VELO optionally IP cuts hellipoutput ~ 30 kHz

HLT2 full reconstruction exclusive and inclusive candidates

Output 2 kHz storage event size ~35 kB

K+

Qvertex QJet

PV

e--

Bs0signal

D

KK

K-B0opposite

Opposite sidendash High Pt leptonsndash Kplusmn from b rarr c rarr

s ndash Vertex chargendash Jet charge

Same sidendash Fragmentation Kplusmn accompanying

Bs

ndash πplusmn from B rarr B() πplusmn

~95

35(K)

10

23

07

15

Bs

~ 51

07 (p)

10

21

04

11

Bd

Same side pK

Combined (Neural Net)

Jet Vertex Charge

Kaon oppside

Electron

Muon

Tag

Effective tagging efficiency

εD2= ε(1-2ω)2 ε tagging efficiency ω wrong tag fraction

Flavour tagging

10

LHCb key measurements

CP-violation

φS

γ in trees

γ in loops

rare B decays

BS μμ

B K μμ

photon polarization in radiative penguin decays

charm physics

Mixing

CP violation

other

τ 3μ (analysis is ongoing)

11

2008 (beginning of 2009) Lumi ~1031 cm-2s-1 10 TeV

~108 sample of minimum bias L0+proto-HLT trigger collect ~ 5 pb-1

Calibration alignment minimum bias physics charmonium production2009 Lumi 2 1032 cm-2s-1 14 TeV

L0 + HLT collect ~ 051 fb-1

B Physics calibration CP (sin2β Δms ) key measurements (βs Bsμμ hellip)2010-2013 Luminosity 2-5 1032 cm-2s-1

collect total of ~10 fb-1

Full physics program Phase I

2013+ Upgrade proposed to run at 2 1033 cm-2s-1

Collect ~ 100 fb-1

Physics program

12

CP violation

13

Key measurement for 2009

φS is small in SM φS =-2βS =-2λ2η asymp -0036

sensitive probe for New Physics φS = φSSM + φS

NP

Measure from time dependent CP asymmetry in bccs

(BS Jψ φ BS Jψ η(ηrsquo) BS ηCφ BS DSDS hellip)

ldquogolden moderdquo BS Jψ φ high BR (~130k per 2 fb-1)

φS measurement

Tevatron resultsD0 s= 057 + 024

-030 with with 28 fb-1

CDFs = [032282] 68CL with 135 fb-1

14

φS measurement

The BSM effect in φS can be discovered or excluded with 20082009 LHCb data

Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even

Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics

15

angle γ

Measured values90 CL

Fit results90 CL

α 875 +311-102

907 + 168 - 54

β 215 +20-19 217 + 20 - 18

γ 768 +527-504

676 + 53 - 159

Least constrained by direct measurementsKey measurement of LHCb

Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics

16

3

2

1From tree amplitudes BS DSKTime dependent CP asymmetry

From tree amplitudes BplusmnDKplusmn B0DK

ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-

GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0

Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-

From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements

angle γ

17

s

s

b

c

u

s

Bs0

Ds

K

Kndash

s

s

b

u

c

s

Bs0

Ds

bull interference between tree level decays via mixingbull insensitive to New Physics

bull Measures + 2s (s from Bs J)

bull Main background Bs Ds

bull 10 times higher branching ratio bull suppressed using PID by RICH

Channel Yield 2 fb-1 BS (90 CL)

BSDSK 62 k [008-04]

BSDS 140 k [008-03]

sif eie2

sif e

KDs

KDs)(0 tBs

)(0 tBs

)0(0sB

γ from BSDSK

18

5 years dataBsrarr Ds

-

Bsrarr Ds-K+

ms = 20)

BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs

Sensitivity at 2 fb-1

s(γ+φs) = 9ondash12o

s(ms) = 0007 ps-1

γ from BSDSK

19

ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K

Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD

Kπ~006)

Colour allowed

Double Cabbibo suppressed

Colour suppressed

Cabbibo favoured

Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects

γ from BDK

20

favoured

colour suppressed

Channel Yield (2 fb-

1)BS

B rarr D(hh) K 78 k 18

B rarr D(K) K Favoured 56 k 06

B rarr D(K) K Suppressed 071k 2

B rarr D(K3) K Favoured 62k 07

B rarr D(K3) K Suppressed 08k 2

() = 5o to 13o

depending on strong phases

Also under studyBplusmn rarr DKplusmn with D rarr Ks

Bplusmn rarr DKplusmn with D rarr KK

B0 rarr DK0 with D rarr KK K

Bplusmn rarr DKplusmn with D rarr KK K(high background)

Overall expect precision of() = 5o with 2 fb-1 of data

Dalitz analyses

()

γ from BDK

24

Rare B decays

25

BSμμ

Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9

Sensitive to NP models with S or P coupling

MSSM Br ~ tan6βMA4

bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity

(SM branching ratio) bull 01 fb-1 BR lt 10-8

bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation

26

Bsφγ

b (L) + (msmb) (R)

In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur

Measuring time-dependent CP asymmetry is a probe for NP

2sinh

2cosh

sincos

)()(

)()()(

tA

tmtAmtA

BB

BBtA mixdir

SS

SSCP

In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1

Channel Yield (2 fb-1)

BS

Bsrarr 11k lt055

Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)

27

BdKμμ

bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now

Channel Yield (2 fb-1) BG (2 fb-1)

BsrarrK+ ndash 7200+-2200 (BR)

1770+-310

Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0

SM(C7C9)=439(+038-035) GeV2

sensitive to NP contribution

s = (m)2 [GeV2]

2 fb-1

A fb(s

) s0

(s0) = 05 GeV2

28

Charm amp tau

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

7

LHCb operation at LHC

Bunch crossing frequency 40 MHz

Design LHC luminosity 1034 cm-2s-

1

Nominal LHCb luminosity 2∙1032 cm-2s-1

(appropriate focusing of the beam)

Expect ge2 fb-1 year

Inelastic pp interactions σ ~ 80 mb

8

LHCb trigger

L0 HLT and L0timesHLT efficiency

HLT rate

Event type Physics

200 Hz Exclusive B decay candidates

B (core programme)

600 Hz High mass dimuons J bJX (lifetime unbiased)

300 Hz D candidates Charm (mixing amp CPV)

900 Hz Inclusive b (eg b)

B (data mining)

L0 Trigger hardware 4 μsec latency

High ET (hgt35 GeV e γgt25 GeV μ μμgt1GeV)

Pileup VETO

Output rate ~1 MHz

High Level Trigger software two stages HLT1 and HLT2

HLT1 confirm L0 objects with T VELO optionally IP cuts hellipoutput ~ 30 kHz

HLT2 full reconstruction exclusive and inclusive candidates

Output 2 kHz storage event size ~35 kB

K+

Qvertex QJet

PV

e--

Bs0signal

D

KK

K-B0opposite

Opposite sidendash High Pt leptonsndash Kplusmn from b rarr c rarr

s ndash Vertex chargendash Jet charge

Same sidendash Fragmentation Kplusmn accompanying

Bs

ndash πplusmn from B rarr B() πplusmn

~95

35(K)

10

23

07

15

Bs

~ 51

07 (p)

10

21

04

11

Bd

Same side pK

Combined (Neural Net)

Jet Vertex Charge

Kaon oppside

Electron

Muon

Tag

Effective tagging efficiency

εD2= ε(1-2ω)2 ε tagging efficiency ω wrong tag fraction

Flavour tagging

10

LHCb key measurements

CP-violation

φS

γ in trees

γ in loops

rare B decays

BS μμ

B K μμ

photon polarization in radiative penguin decays

charm physics

Mixing

CP violation

other

τ 3μ (analysis is ongoing)

11

2008 (beginning of 2009) Lumi ~1031 cm-2s-1 10 TeV

~108 sample of minimum bias L0+proto-HLT trigger collect ~ 5 pb-1

Calibration alignment minimum bias physics charmonium production2009 Lumi 2 1032 cm-2s-1 14 TeV

L0 + HLT collect ~ 051 fb-1

B Physics calibration CP (sin2β Δms ) key measurements (βs Bsμμ hellip)2010-2013 Luminosity 2-5 1032 cm-2s-1

collect total of ~10 fb-1

Full physics program Phase I

2013+ Upgrade proposed to run at 2 1033 cm-2s-1

Collect ~ 100 fb-1

Physics program

12

CP violation

13

Key measurement for 2009

φS is small in SM φS =-2βS =-2λ2η asymp -0036

sensitive probe for New Physics φS = φSSM + φS

NP

Measure from time dependent CP asymmetry in bccs

(BS Jψ φ BS Jψ η(ηrsquo) BS ηCφ BS DSDS hellip)

ldquogolden moderdquo BS Jψ φ high BR (~130k per 2 fb-1)

φS measurement

Tevatron resultsD0 s= 057 + 024

-030 with with 28 fb-1

CDFs = [032282] 68CL with 135 fb-1

14

φS measurement

The BSM effect in φS can be discovered or excluded with 20082009 LHCb data

Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even

Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics

15

angle γ

Measured values90 CL

Fit results90 CL

α 875 +311-102

907 + 168 - 54

β 215 +20-19 217 + 20 - 18

γ 768 +527-504

676 + 53 - 159

Least constrained by direct measurementsKey measurement of LHCb

Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics

16

3

2

1From tree amplitudes BS DSKTime dependent CP asymmetry

From tree amplitudes BplusmnDKplusmn B0DK

ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-

GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0

Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-

From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements

angle γ

17

s

s

b

c

u

s

Bs0

Ds

K

Kndash

s

s

b

u

c

s

Bs0

Ds

bull interference between tree level decays via mixingbull insensitive to New Physics

bull Measures + 2s (s from Bs J)

bull Main background Bs Ds

bull 10 times higher branching ratio bull suppressed using PID by RICH

Channel Yield 2 fb-1 BS (90 CL)

BSDSK 62 k [008-04]

BSDS 140 k [008-03]

sif eie2

sif e

KDs

KDs)(0 tBs

)(0 tBs

)0(0sB

γ from BSDSK

18

5 years dataBsrarr Ds

-

Bsrarr Ds-K+

ms = 20)

BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs

Sensitivity at 2 fb-1

s(γ+φs) = 9ondash12o

s(ms) = 0007 ps-1

γ from BSDSK

19

ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K

Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD

Kπ~006)

Colour allowed

Double Cabbibo suppressed

Colour suppressed

Cabbibo favoured

Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects

γ from BDK

20

favoured

colour suppressed

Channel Yield (2 fb-

1)BS

B rarr D(hh) K 78 k 18

B rarr D(K) K Favoured 56 k 06

B rarr D(K) K Suppressed 071k 2

B rarr D(K3) K Favoured 62k 07

B rarr D(K3) K Suppressed 08k 2

() = 5o to 13o

depending on strong phases

Also under studyBplusmn rarr DKplusmn with D rarr Ks

Bplusmn rarr DKplusmn with D rarr KK

B0 rarr DK0 with D rarr KK K

Bplusmn rarr DKplusmn with D rarr KK K(high background)

Overall expect precision of() = 5o with 2 fb-1 of data

Dalitz analyses

()

γ from BDK

24

Rare B decays

25

BSμμ

Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9

Sensitive to NP models with S or P coupling

MSSM Br ~ tan6βMA4

bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity

(SM branching ratio) bull 01 fb-1 BR lt 10-8

bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation

26

Bsφγ

b (L) + (msmb) (R)

In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur

Measuring time-dependent CP asymmetry is a probe for NP

2sinh

2cosh

sincos

)()(

)()()(

tA

tmtAmtA

BB

BBtA mixdir

SS

SSCP

In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1

Channel Yield (2 fb-1)

BS

Bsrarr 11k lt055

Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)

27

BdKμμ

bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now

Channel Yield (2 fb-1) BG (2 fb-1)

BsrarrK+ ndash 7200+-2200 (BR)

1770+-310

Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0

SM(C7C9)=439(+038-035) GeV2

sensitive to NP contribution

s = (m)2 [GeV2]

2 fb-1

A fb(s

) s0

(s0) = 05 GeV2

28

Charm amp tau

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

8

LHCb trigger

L0 HLT and L0timesHLT efficiency

HLT rate

Event type Physics

200 Hz Exclusive B decay candidates

B (core programme)

600 Hz High mass dimuons J bJX (lifetime unbiased)

300 Hz D candidates Charm (mixing amp CPV)

900 Hz Inclusive b (eg b)

B (data mining)

L0 Trigger hardware 4 μsec latency

High ET (hgt35 GeV e γgt25 GeV μ μμgt1GeV)

Pileup VETO

Output rate ~1 MHz

High Level Trigger software two stages HLT1 and HLT2

HLT1 confirm L0 objects with T VELO optionally IP cuts hellipoutput ~ 30 kHz

HLT2 full reconstruction exclusive and inclusive candidates

Output 2 kHz storage event size ~35 kB

K+

Qvertex QJet

PV

e--

Bs0signal

D

KK

K-B0opposite

Opposite sidendash High Pt leptonsndash Kplusmn from b rarr c rarr

s ndash Vertex chargendash Jet charge

Same sidendash Fragmentation Kplusmn accompanying

Bs

ndash πplusmn from B rarr B() πplusmn

~95

35(K)

10

23

07

15

Bs

~ 51

07 (p)

10

21

04

11

Bd

Same side pK

Combined (Neural Net)

Jet Vertex Charge

Kaon oppside

Electron

Muon

Tag

Effective tagging efficiency

εD2= ε(1-2ω)2 ε tagging efficiency ω wrong tag fraction

Flavour tagging

10

LHCb key measurements

CP-violation

φS

γ in trees

γ in loops

rare B decays

BS μμ

B K μμ

photon polarization in radiative penguin decays

charm physics

Mixing

CP violation

other

τ 3μ (analysis is ongoing)

11

2008 (beginning of 2009) Lumi ~1031 cm-2s-1 10 TeV

~108 sample of minimum bias L0+proto-HLT trigger collect ~ 5 pb-1

Calibration alignment minimum bias physics charmonium production2009 Lumi 2 1032 cm-2s-1 14 TeV

L0 + HLT collect ~ 051 fb-1

B Physics calibration CP (sin2β Δms ) key measurements (βs Bsμμ hellip)2010-2013 Luminosity 2-5 1032 cm-2s-1

collect total of ~10 fb-1

Full physics program Phase I

2013+ Upgrade proposed to run at 2 1033 cm-2s-1

Collect ~ 100 fb-1

Physics program

12

CP violation

13

Key measurement for 2009

φS is small in SM φS =-2βS =-2λ2η asymp -0036

sensitive probe for New Physics φS = φSSM + φS

NP

Measure from time dependent CP asymmetry in bccs

(BS Jψ φ BS Jψ η(ηrsquo) BS ηCφ BS DSDS hellip)

ldquogolden moderdquo BS Jψ φ high BR (~130k per 2 fb-1)

φS measurement

Tevatron resultsD0 s= 057 + 024

-030 with with 28 fb-1

CDFs = [032282] 68CL with 135 fb-1

14

φS measurement

The BSM effect in φS can be discovered or excluded with 20082009 LHCb data

Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even

Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics

15

angle γ

Measured values90 CL

Fit results90 CL

α 875 +311-102

907 + 168 - 54

β 215 +20-19 217 + 20 - 18

γ 768 +527-504

676 + 53 - 159

Least constrained by direct measurementsKey measurement of LHCb

Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics

16

3

2

1From tree amplitudes BS DSKTime dependent CP asymmetry

From tree amplitudes BplusmnDKplusmn B0DK

ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-

GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0

Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-

From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements

angle γ

17

s

s

b

c

u

s

Bs0

Ds

K

Kndash

s

s

b

u

c

s

Bs0

Ds

bull interference between tree level decays via mixingbull insensitive to New Physics

bull Measures + 2s (s from Bs J)

bull Main background Bs Ds

bull 10 times higher branching ratio bull suppressed using PID by RICH

Channel Yield 2 fb-1 BS (90 CL)

BSDSK 62 k [008-04]

BSDS 140 k [008-03]

sif eie2

sif e

KDs

KDs)(0 tBs

)(0 tBs

)0(0sB

γ from BSDSK

18

5 years dataBsrarr Ds

-

Bsrarr Ds-K+

ms = 20)

BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs

Sensitivity at 2 fb-1

s(γ+φs) = 9ondash12o

s(ms) = 0007 ps-1

γ from BSDSK

19

ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K

Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD

Kπ~006)

Colour allowed

Double Cabbibo suppressed

Colour suppressed

Cabbibo favoured

Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects

γ from BDK

20

favoured

colour suppressed

Channel Yield (2 fb-

1)BS

B rarr D(hh) K 78 k 18

B rarr D(K) K Favoured 56 k 06

B rarr D(K) K Suppressed 071k 2

B rarr D(K3) K Favoured 62k 07

B rarr D(K3) K Suppressed 08k 2

() = 5o to 13o

depending on strong phases

Also under studyBplusmn rarr DKplusmn with D rarr Ks

Bplusmn rarr DKplusmn with D rarr KK

B0 rarr DK0 with D rarr KK K

Bplusmn rarr DKplusmn with D rarr KK K(high background)

Overall expect precision of() = 5o with 2 fb-1 of data

Dalitz analyses

()

γ from BDK

24

Rare B decays

25

BSμμ

Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9

Sensitive to NP models with S or P coupling

MSSM Br ~ tan6βMA4

bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity

(SM branching ratio) bull 01 fb-1 BR lt 10-8

bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation

26

Bsφγ

b (L) + (msmb) (R)

In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur

Measuring time-dependent CP asymmetry is a probe for NP

2sinh

2cosh

sincos

)()(

)()()(

tA

tmtAmtA

BB

BBtA mixdir

SS

SSCP

In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1

Channel Yield (2 fb-1)

BS

Bsrarr 11k lt055

Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)

27

BdKμμ

bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now

Channel Yield (2 fb-1) BG (2 fb-1)

BsrarrK+ ndash 7200+-2200 (BR)

1770+-310

Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0

SM(C7C9)=439(+038-035) GeV2

sensitive to NP contribution

s = (m)2 [GeV2]

2 fb-1

A fb(s

) s0

(s0) = 05 GeV2

28

Charm amp tau

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

K+

Qvertex QJet

PV

e--

Bs0signal

D

KK

K-B0opposite

Opposite sidendash High Pt leptonsndash Kplusmn from b rarr c rarr

s ndash Vertex chargendash Jet charge

Same sidendash Fragmentation Kplusmn accompanying

Bs

ndash πplusmn from B rarr B() πplusmn

~95

35(K)

10

23

07

15

Bs

~ 51

07 (p)

10

21

04

11

Bd

Same side pK

Combined (Neural Net)

Jet Vertex Charge

Kaon oppside

Electron

Muon

Tag

Effective tagging efficiency

εD2= ε(1-2ω)2 ε tagging efficiency ω wrong tag fraction

Flavour tagging

10

LHCb key measurements

CP-violation

φS

γ in trees

γ in loops

rare B decays

BS μμ

B K μμ

photon polarization in radiative penguin decays

charm physics

Mixing

CP violation

other

τ 3μ (analysis is ongoing)

11

2008 (beginning of 2009) Lumi ~1031 cm-2s-1 10 TeV

~108 sample of minimum bias L0+proto-HLT trigger collect ~ 5 pb-1

Calibration alignment minimum bias physics charmonium production2009 Lumi 2 1032 cm-2s-1 14 TeV

L0 + HLT collect ~ 051 fb-1

B Physics calibration CP (sin2β Δms ) key measurements (βs Bsμμ hellip)2010-2013 Luminosity 2-5 1032 cm-2s-1

collect total of ~10 fb-1

Full physics program Phase I

2013+ Upgrade proposed to run at 2 1033 cm-2s-1

Collect ~ 100 fb-1

Physics program

12

CP violation

13

Key measurement for 2009

φS is small in SM φS =-2βS =-2λ2η asymp -0036

sensitive probe for New Physics φS = φSSM + φS

NP

Measure from time dependent CP asymmetry in bccs

(BS Jψ φ BS Jψ η(ηrsquo) BS ηCφ BS DSDS hellip)

ldquogolden moderdquo BS Jψ φ high BR (~130k per 2 fb-1)

φS measurement

Tevatron resultsD0 s= 057 + 024

-030 with with 28 fb-1

CDFs = [032282] 68CL with 135 fb-1

14

φS measurement

The BSM effect in φS can be discovered or excluded with 20082009 LHCb data

Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even

Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics

15

angle γ

Measured values90 CL

Fit results90 CL

α 875 +311-102

907 + 168 - 54

β 215 +20-19 217 + 20 - 18

γ 768 +527-504

676 + 53 - 159

Least constrained by direct measurementsKey measurement of LHCb

Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics

16

3

2

1From tree amplitudes BS DSKTime dependent CP asymmetry

From tree amplitudes BplusmnDKplusmn B0DK

ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-

GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0

Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-

From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements

angle γ

17

s

s

b

c

u

s

Bs0

Ds

K

Kndash

s

s

b

u

c

s

Bs0

Ds

bull interference between tree level decays via mixingbull insensitive to New Physics

bull Measures + 2s (s from Bs J)

bull Main background Bs Ds

bull 10 times higher branching ratio bull suppressed using PID by RICH

Channel Yield 2 fb-1 BS (90 CL)

BSDSK 62 k [008-04]

BSDS 140 k [008-03]

sif eie2

sif e

KDs

KDs)(0 tBs

)(0 tBs

)0(0sB

γ from BSDSK

18

5 years dataBsrarr Ds

-

Bsrarr Ds-K+

ms = 20)

BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs

Sensitivity at 2 fb-1

s(γ+φs) = 9ondash12o

s(ms) = 0007 ps-1

γ from BSDSK

19

ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K

Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD

Kπ~006)

Colour allowed

Double Cabbibo suppressed

Colour suppressed

Cabbibo favoured

Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects

γ from BDK

20

favoured

colour suppressed

Channel Yield (2 fb-

1)BS

B rarr D(hh) K 78 k 18

B rarr D(K) K Favoured 56 k 06

B rarr D(K) K Suppressed 071k 2

B rarr D(K3) K Favoured 62k 07

B rarr D(K3) K Suppressed 08k 2

() = 5o to 13o

depending on strong phases

Also under studyBplusmn rarr DKplusmn with D rarr Ks

Bplusmn rarr DKplusmn with D rarr KK

B0 rarr DK0 with D rarr KK K

Bplusmn rarr DKplusmn with D rarr KK K(high background)

Overall expect precision of() = 5o with 2 fb-1 of data

Dalitz analyses

()

γ from BDK

24

Rare B decays

25

BSμμ

Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9

Sensitive to NP models with S or P coupling

MSSM Br ~ tan6βMA4

bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity

(SM branching ratio) bull 01 fb-1 BR lt 10-8

bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation

26

Bsφγ

b (L) + (msmb) (R)

In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur

Measuring time-dependent CP asymmetry is a probe for NP

2sinh

2cosh

sincos

)()(

)()()(

tA

tmtAmtA

BB

BBtA mixdir

SS

SSCP

In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1

Channel Yield (2 fb-1)

BS

Bsrarr 11k lt055

Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)

27

BdKμμ

bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now

Channel Yield (2 fb-1) BG (2 fb-1)

BsrarrK+ ndash 7200+-2200 (BR)

1770+-310

Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0

SM(C7C9)=439(+038-035) GeV2

sensitive to NP contribution

s = (m)2 [GeV2]

2 fb-1

A fb(s

) s0

(s0) = 05 GeV2

28

Charm amp tau

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

10

LHCb key measurements

CP-violation

φS

γ in trees

γ in loops

rare B decays

BS μμ

B K μμ

photon polarization in radiative penguin decays

charm physics

Mixing

CP violation

other

τ 3μ (analysis is ongoing)

11

2008 (beginning of 2009) Lumi ~1031 cm-2s-1 10 TeV

~108 sample of minimum bias L0+proto-HLT trigger collect ~ 5 pb-1

Calibration alignment minimum bias physics charmonium production2009 Lumi 2 1032 cm-2s-1 14 TeV

L0 + HLT collect ~ 051 fb-1

B Physics calibration CP (sin2β Δms ) key measurements (βs Bsμμ hellip)2010-2013 Luminosity 2-5 1032 cm-2s-1

collect total of ~10 fb-1

Full physics program Phase I

2013+ Upgrade proposed to run at 2 1033 cm-2s-1

Collect ~ 100 fb-1

Physics program

12

CP violation

13

Key measurement for 2009

φS is small in SM φS =-2βS =-2λ2η asymp -0036

sensitive probe for New Physics φS = φSSM + φS

NP

Measure from time dependent CP asymmetry in bccs

(BS Jψ φ BS Jψ η(ηrsquo) BS ηCφ BS DSDS hellip)

ldquogolden moderdquo BS Jψ φ high BR (~130k per 2 fb-1)

φS measurement

Tevatron resultsD0 s= 057 + 024

-030 with with 28 fb-1

CDFs = [032282] 68CL with 135 fb-1

14

φS measurement

The BSM effect in φS can be discovered or excluded with 20082009 LHCb data

Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even

Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics

15

angle γ

Measured values90 CL

Fit results90 CL

α 875 +311-102

907 + 168 - 54

β 215 +20-19 217 + 20 - 18

γ 768 +527-504

676 + 53 - 159

Least constrained by direct measurementsKey measurement of LHCb

Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics

16

3

2

1From tree amplitudes BS DSKTime dependent CP asymmetry

From tree amplitudes BplusmnDKplusmn B0DK

ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-

GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0

Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-

From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements

angle γ

17

s

s

b

c

u

s

Bs0

Ds

K

Kndash

s

s

b

u

c

s

Bs0

Ds

bull interference between tree level decays via mixingbull insensitive to New Physics

bull Measures + 2s (s from Bs J)

bull Main background Bs Ds

bull 10 times higher branching ratio bull suppressed using PID by RICH

Channel Yield 2 fb-1 BS (90 CL)

BSDSK 62 k [008-04]

BSDS 140 k [008-03]

sif eie2

sif e

KDs

KDs)(0 tBs

)(0 tBs

)0(0sB

γ from BSDSK

18

5 years dataBsrarr Ds

-

Bsrarr Ds-K+

ms = 20)

BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs

Sensitivity at 2 fb-1

s(γ+φs) = 9ondash12o

s(ms) = 0007 ps-1

γ from BSDSK

19

ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K

Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD

Kπ~006)

Colour allowed

Double Cabbibo suppressed

Colour suppressed

Cabbibo favoured

Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects

γ from BDK

20

favoured

colour suppressed

Channel Yield (2 fb-

1)BS

B rarr D(hh) K 78 k 18

B rarr D(K) K Favoured 56 k 06

B rarr D(K) K Suppressed 071k 2

B rarr D(K3) K Favoured 62k 07

B rarr D(K3) K Suppressed 08k 2

() = 5o to 13o

depending on strong phases

Also under studyBplusmn rarr DKplusmn with D rarr Ks

Bplusmn rarr DKplusmn with D rarr KK

B0 rarr DK0 with D rarr KK K

Bplusmn rarr DKplusmn with D rarr KK K(high background)

Overall expect precision of() = 5o with 2 fb-1 of data

Dalitz analyses

()

γ from BDK

24

Rare B decays

25

BSμμ

Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9

Sensitive to NP models with S or P coupling

MSSM Br ~ tan6βMA4

bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity

(SM branching ratio) bull 01 fb-1 BR lt 10-8

bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation

26

Bsφγ

b (L) + (msmb) (R)

In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur

Measuring time-dependent CP asymmetry is a probe for NP

2sinh

2cosh

sincos

)()(

)()()(

tA

tmtAmtA

BB

BBtA mixdir

SS

SSCP

In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1

Channel Yield (2 fb-1)

BS

Bsrarr 11k lt055

Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)

27

BdKμμ

bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now

Channel Yield (2 fb-1) BG (2 fb-1)

BsrarrK+ ndash 7200+-2200 (BR)

1770+-310

Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0

SM(C7C9)=439(+038-035) GeV2

sensitive to NP contribution

s = (m)2 [GeV2]

2 fb-1

A fb(s

) s0

(s0) = 05 GeV2

28

Charm amp tau

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

11

2008 (beginning of 2009) Lumi ~1031 cm-2s-1 10 TeV

~108 sample of minimum bias L0+proto-HLT trigger collect ~ 5 pb-1

Calibration alignment minimum bias physics charmonium production2009 Lumi 2 1032 cm-2s-1 14 TeV

L0 + HLT collect ~ 051 fb-1

B Physics calibration CP (sin2β Δms ) key measurements (βs Bsμμ hellip)2010-2013 Luminosity 2-5 1032 cm-2s-1

collect total of ~10 fb-1

Full physics program Phase I

2013+ Upgrade proposed to run at 2 1033 cm-2s-1

Collect ~ 100 fb-1

Physics program

12

CP violation

13

Key measurement for 2009

φS is small in SM φS =-2βS =-2λ2η asymp -0036

sensitive probe for New Physics φS = φSSM + φS

NP

Measure from time dependent CP asymmetry in bccs

(BS Jψ φ BS Jψ η(ηrsquo) BS ηCφ BS DSDS hellip)

ldquogolden moderdquo BS Jψ φ high BR (~130k per 2 fb-1)

φS measurement

Tevatron resultsD0 s= 057 + 024

-030 with with 28 fb-1

CDFs = [032282] 68CL with 135 fb-1

14

φS measurement

The BSM effect in φS can be discovered or excluded with 20082009 LHCb data

Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even

Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics

15

angle γ

Measured values90 CL

Fit results90 CL

α 875 +311-102

907 + 168 - 54

β 215 +20-19 217 + 20 - 18

γ 768 +527-504

676 + 53 - 159

Least constrained by direct measurementsKey measurement of LHCb

Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics

16

3

2

1From tree amplitudes BS DSKTime dependent CP asymmetry

From tree amplitudes BplusmnDKplusmn B0DK

ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-

GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0

Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-

From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements

angle γ

17

s

s

b

c

u

s

Bs0

Ds

K

Kndash

s

s

b

u

c

s

Bs0

Ds

bull interference between tree level decays via mixingbull insensitive to New Physics

bull Measures + 2s (s from Bs J)

bull Main background Bs Ds

bull 10 times higher branching ratio bull suppressed using PID by RICH

Channel Yield 2 fb-1 BS (90 CL)

BSDSK 62 k [008-04]

BSDS 140 k [008-03]

sif eie2

sif e

KDs

KDs)(0 tBs

)(0 tBs

)0(0sB

γ from BSDSK

18

5 years dataBsrarr Ds

-

Bsrarr Ds-K+

ms = 20)

BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs

Sensitivity at 2 fb-1

s(γ+φs) = 9ondash12o

s(ms) = 0007 ps-1

γ from BSDSK

19

ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K

Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD

Kπ~006)

Colour allowed

Double Cabbibo suppressed

Colour suppressed

Cabbibo favoured

Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects

γ from BDK

20

favoured

colour suppressed

Channel Yield (2 fb-

1)BS

B rarr D(hh) K 78 k 18

B rarr D(K) K Favoured 56 k 06

B rarr D(K) K Suppressed 071k 2

B rarr D(K3) K Favoured 62k 07

B rarr D(K3) K Suppressed 08k 2

() = 5o to 13o

depending on strong phases

Also under studyBplusmn rarr DKplusmn with D rarr Ks

Bplusmn rarr DKplusmn with D rarr KK

B0 rarr DK0 with D rarr KK K

Bplusmn rarr DKplusmn with D rarr KK K(high background)

Overall expect precision of() = 5o with 2 fb-1 of data

Dalitz analyses

()

γ from BDK

24

Rare B decays

25

BSμμ

Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9

Sensitive to NP models with S or P coupling

MSSM Br ~ tan6βMA4

bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity

(SM branching ratio) bull 01 fb-1 BR lt 10-8

bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation

26

Bsφγ

b (L) + (msmb) (R)

In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur

Measuring time-dependent CP asymmetry is a probe for NP

2sinh

2cosh

sincos

)()(

)()()(

tA

tmtAmtA

BB

BBtA mixdir

SS

SSCP

In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1

Channel Yield (2 fb-1)

BS

Bsrarr 11k lt055

Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)

27

BdKμμ

bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now

Channel Yield (2 fb-1) BG (2 fb-1)

BsrarrK+ ndash 7200+-2200 (BR)

1770+-310

Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0

SM(C7C9)=439(+038-035) GeV2

sensitive to NP contribution

s = (m)2 [GeV2]

2 fb-1

A fb(s

) s0

(s0) = 05 GeV2

28

Charm amp tau

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

12

CP violation

13

Key measurement for 2009

φS is small in SM φS =-2βS =-2λ2η asymp -0036

sensitive probe for New Physics φS = φSSM + φS

NP

Measure from time dependent CP asymmetry in bccs

(BS Jψ φ BS Jψ η(ηrsquo) BS ηCφ BS DSDS hellip)

ldquogolden moderdquo BS Jψ φ high BR (~130k per 2 fb-1)

φS measurement

Tevatron resultsD0 s= 057 + 024

-030 with with 28 fb-1

CDFs = [032282] 68CL with 135 fb-1

14

φS measurement

The BSM effect in φS can be discovered or excluded with 20082009 LHCb data

Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even

Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics

15

angle γ

Measured values90 CL

Fit results90 CL

α 875 +311-102

907 + 168 - 54

β 215 +20-19 217 + 20 - 18

γ 768 +527-504

676 + 53 - 159

Least constrained by direct measurementsKey measurement of LHCb

Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics

16

3

2

1From tree amplitudes BS DSKTime dependent CP asymmetry

From tree amplitudes BplusmnDKplusmn B0DK

ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-

GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0

Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-

From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements

angle γ

17

s

s

b

c

u

s

Bs0

Ds

K

Kndash

s

s

b

u

c

s

Bs0

Ds

bull interference between tree level decays via mixingbull insensitive to New Physics

bull Measures + 2s (s from Bs J)

bull Main background Bs Ds

bull 10 times higher branching ratio bull suppressed using PID by RICH

Channel Yield 2 fb-1 BS (90 CL)

BSDSK 62 k [008-04]

BSDS 140 k [008-03]

sif eie2

sif e

KDs

KDs)(0 tBs

)(0 tBs

)0(0sB

γ from BSDSK

18

5 years dataBsrarr Ds

-

Bsrarr Ds-K+

ms = 20)

BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs

Sensitivity at 2 fb-1

s(γ+φs) = 9ondash12o

s(ms) = 0007 ps-1

γ from BSDSK

19

ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K

Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD

Kπ~006)

Colour allowed

Double Cabbibo suppressed

Colour suppressed

Cabbibo favoured

Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects

γ from BDK

20

favoured

colour suppressed

Channel Yield (2 fb-

1)BS

B rarr D(hh) K 78 k 18

B rarr D(K) K Favoured 56 k 06

B rarr D(K) K Suppressed 071k 2

B rarr D(K3) K Favoured 62k 07

B rarr D(K3) K Suppressed 08k 2

() = 5o to 13o

depending on strong phases

Also under studyBplusmn rarr DKplusmn with D rarr Ks

Bplusmn rarr DKplusmn with D rarr KK

B0 rarr DK0 with D rarr KK K

Bplusmn rarr DKplusmn with D rarr KK K(high background)

Overall expect precision of() = 5o with 2 fb-1 of data

Dalitz analyses

()

γ from BDK

24

Rare B decays

25

BSμμ

Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9

Sensitive to NP models with S or P coupling

MSSM Br ~ tan6βMA4

bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity

(SM branching ratio) bull 01 fb-1 BR lt 10-8

bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation

26

Bsφγ

b (L) + (msmb) (R)

In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur

Measuring time-dependent CP asymmetry is a probe for NP

2sinh

2cosh

sincos

)()(

)()()(

tA

tmtAmtA

BB

BBtA mixdir

SS

SSCP

In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1

Channel Yield (2 fb-1)

BS

Bsrarr 11k lt055

Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)

27

BdKμμ

bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now

Channel Yield (2 fb-1) BG (2 fb-1)

BsrarrK+ ndash 7200+-2200 (BR)

1770+-310

Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0

SM(C7C9)=439(+038-035) GeV2

sensitive to NP contribution

s = (m)2 [GeV2]

2 fb-1

A fb(s

) s0

(s0) = 05 GeV2

28

Charm amp tau

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

13

Key measurement for 2009

φS is small in SM φS =-2βS =-2λ2η asymp -0036

sensitive probe for New Physics φS = φSSM + φS

NP

Measure from time dependent CP asymmetry in bccs

(BS Jψ φ BS Jψ η(ηrsquo) BS ηCφ BS DSDS hellip)

ldquogolden moderdquo BS Jψ φ high BR (~130k per 2 fb-1)

φS measurement

Tevatron resultsD0 s= 057 + 024

-030 with with 28 fb-1

CDFs = [032282] 68CL with 135 fb-1

14

φS measurement

The BSM effect in φS can be discovered or excluded with 20082009 LHCb data

Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even

Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics

15

angle γ

Measured values90 CL

Fit results90 CL

α 875 +311-102

907 + 168 - 54

β 215 +20-19 217 + 20 - 18

γ 768 +527-504

676 + 53 - 159

Least constrained by direct measurementsKey measurement of LHCb

Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics

16

3

2

1From tree amplitudes BS DSKTime dependent CP asymmetry

From tree amplitudes BplusmnDKplusmn B0DK

ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-

GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0

Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-

From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements

angle γ

17

s

s

b

c

u

s

Bs0

Ds

K

Kndash

s

s

b

u

c

s

Bs0

Ds

bull interference between tree level decays via mixingbull insensitive to New Physics

bull Measures + 2s (s from Bs J)

bull Main background Bs Ds

bull 10 times higher branching ratio bull suppressed using PID by RICH

Channel Yield 2 fb-1 BS (90 CL)

BSDSK 62 k [008-04]

BSDS 140 k [008-03]

sif eie2

sif e

KDs

KDs)(0 tBs

)(0 tBs

)0(0sB

γ from BSDSK

18

5 years dataBsrarr Ds

-

Bsrarr Ds-K+

ms = 20)

BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs

Sensitivity at 2 fb-1

s(γ+φs) = 9ondash12o

s(ms) = 0007 ps-1

γ from BSDSK

19

ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K

Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD

Kπ~006)

Colour allowed

Double Cabbibo suppressed

Colour suppressed

Cabbibo favoured

Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects

γ from BDK

20

favoured

colour suppressed

Channel Yield (2 fb-

1)BS

B rarr D(hh) K 78 k 18

B rarr D(K) K Favoured 56 k 06

B rarr D(K) K Suppressed 071k 2

B rarr D(K3) K Favoured 62k 07

B rarr D(K3) K Suppressed 08k 2

() = 5o to 13o

depending on strong phases

Also under studyBplusmn rarr DKplusmn with D rarr Ks

Bplusmn rarr DKplusmn with D rarr KK

B0 rarr DK0 with D rarr KK K

Bplusmn rarr DKplusmn with D rarr KK K(high background)

Overall expect precision of() = 5o with 2 fb-1 of data

Dalitz analyses

()

γ from BDK

24

Rare B decays

25

BSμμ

Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9

Sensitive to NP models with S or P coupling

MSSM Br ~ tan6βMA4

bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity

(SM branching ratio) bull 01 fb-1 BR lt 10-8

bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation

26

Bsφγ

b (L) + (msmb) (R)

In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur

Measuring time-dependent CP asymmetry is a probe for NP

2sinh

2cosh

sincos

)()(

)()()(

tA

tmtAmtA

BB

BBtA mixdir

SS

SSCP

In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1

Channel Yield (2 fb-1)

BS

Bsrarr 11k lt055

Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)

27

BdKμμ

bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now

Channel Yield (2 fb-1) BG (2 fb-1)

BsrarrK+ ndash 7200+-2200 (BR)

1770+-310

Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0

SM(C7C9)=439(+038-035) GeV2

sensitive to NP contribution

s = (m)2 [GeV2]

2 fb-1

A fb(s

) s0

(s0) = 05 GeV2

28

Charm amp tau

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

14

φS measurement

The BSM effect in φS can be discovered or excluded with 20082009 LHCb data

Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even

Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics

15

angle γ

Measured values90 CL

Fit results90 CL

α 875 +311-102

907 + 168 - 54

β 215 +20-19 217 + 20 - 18

γ 768 +527-504

676 + 53 - 159

Least constrained by direct measurementsKey measurement of LHCb

Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics

16

3

2

1From tree amplitudes BS DSKTime dependent CP asymmetry

From tree amplitudes BplusmnDKplusmn B0DK

ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-

GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0

Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-

From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements

angle γ

17

s

s

b

c

u

s

Bs0

Ds

K

Kndash

s

s

b

u

c

s

Bs0

Ds

bull interference between tree level decays via mixingbull insensitive to New Physics

bull Measures + 2s (s from Bs J)

bull Main background Bs Ds

bull 10 times higher branching ratio bull suppressed using PID by RICH

Channel Yield 2 fb-1 BS (90 CL)

BSDSK 62 k [008-04]

BSDS 140 k [008-03]

sif eie2

sif e

KDs

KDs)(0 tBs

)(0 tBs

)0(0sB

γ from BSDSK

18

5 years dataBsrarr Ds

-

Bsrarr Ds-K+

ms = 20)

BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs

Sensitivity at 2 fb-1

s(γ+φs) = 9ondash12o

s(ms) = 0007 ps-1

γ from BSDSK

19

ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K

Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD

Kπ~006)

Colour allowed

Double Cabbibo suppressed

Colour suppressed

Cabbibo favoured

Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects

γ from BDK

20

favoured

colour suppressed

Channel Yield (2 fb-

1)BS

B rarr D(hh) K 78 k 18

B rarr D(K) K Favoured 56 k 06

B rarr D(K) K Suppressed 071k 2

B rarr D(K3) K Favoured 62k 07

B rarr D(K3) K Suppressed 08k 2

() = 5o to 13o

depending on strong phases

Also under studyBplusmn rarr DKplusmn with D rarr Ks

Bplusmn rarr DKplusmn with D rarr KK

B0 rarr DK0 with D rarr KK K

Bplusmn rarr DKplusmn with D rarr KK K(high background)

Overall expect precision of() = 5o with 2 fb-1 of data

Dalitz analyses

()

γ from BDK

24

Rare B decays

25

BSμμ

Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9

Sensitive to NP models with S or P coupling

MSSM Br ~ tan6βMA4

bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity

(SM branching ratio) bull 01 fb-1 BR lt 10-8

bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation

26

Bsφγ

b (L) + (msmb) (R)

In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur

Measuring time-dependent CP asymmetry is a probe for NP

2sinh

2cosh

sincos

)()(

)()()(

tA

tmtAmtA

BB

BBtA mixdir

SS

SSCP

In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1

Channel Yield (2 fb-1)

BS

Bsrarr 11k lt055

Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)

27

BdKμμ

bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now

Channel Yield (2 fb-1) BG (2 fb-1)

BsrarrK+ ndash 7200+-2200 (BR)

1770+-310

Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0

SM(C7C9)=439(+038-035) GeV2

sensitive to NP contribution

s = (m)2 [GeV2]

2 fb-1

A fb(s

) s0

(s0) = 05 GeV2

28

Charm amp tau

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

15

angle γ

Measured values90 CL

Fit results90 CL

α 875 +311-102

907 + 168 - 54

β 215 +20-19 217 + 20 - 18

γ 768 +527-504

676 + 53 - 159

Least constrained by direct measurementsKey measurement of LHCb

Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics

16

3

2

1From tree amplitudes BS DSKTime dependent CP asymmetry

From tree amplitudes BplusmnDKplusmn B0DK

ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-

GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0

Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-

From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements

angle γ

17

s

s

b

c

u

s

Bs0

Ds

K

Kndash

s

s

b

u

c

s

Bs0

Ds

bull interference between tree level decays via mixingbull insensitive to New Physics

bull Measures + 2s (s from Bs J)

bull Main background Bs Ds

bull 10 times higher branching ratio bull suppressed using PID by RICH

Channel Yield 2 fb-1 BS (90 CL)

BSDSK 62 k [008-04]

BSDS 140 k [008-03]

sif eie2

sif e

KDs

KDs)(0 tBs

)(0 tBs

)0(0sB

γ from BSDSK

18

5 years dataBsrarr Ds

-

Bsrarr Ds-K+

ms = 20)

BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs

Sensitivity at 2 fb-1

s(γ+φs) = 9ondash12o

s(ms) = 0007 ps-1

γ from BSDSK

19

ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K

Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD

Kπ~006)

Colour allowed

Double Cabbibo suppressed

Colour suppressed

Cabbibo favoured

Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects

γ from BDK

20

favoured

colour suppressed

Channel Yield (2 fb-

1)BS

B rarr D(hh) K 78 k 18

B rarr D(K) K Favoured 56 k 06

B rarr D(K) K Suppressed 071k 2

B rarr D(K3) K Favoured 62k 07

B rarr D(K3) K Suppressed 08k 2

() = 5o to 13o

depending on strong phases

Also under studyBplusmn rarr DKplusmn with D rarr Ks

Bplusmn rarr DKplusmn with D rarr KK

B0 rarr DK0 with D rarr KK K

Bplusmn rarr DKplusmn with D rarr KK K(high background)

Overall expect precision of() = 5o with 2 fb-1 of data

Dalitz analyses

()

γ from BDK

24

Rare B decays

25

BSμμ

Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9

Sensitive to NP models with S or P coupling

MSSM Br ~ tan6βMA4

bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity

(SM branching ratio) bull 01 fb-1 BR lt 10-8

bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation

26

Bsφγ

b (L) + (msmb) (R)

In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur

Measuring time-dependent CP asymmetry is a probe for NP

2sinh

2cosh

sincos

)()(

)()()(

tA

tmtAmtA

BB

BBtA mixdir

SS

SSCP

In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1

Channel Yield (2 fb-1)

BS

Bsrarr 11k lt055

Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)

27

BdKμμ

bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now

Channel Yield (2 fb-1) BG (2 fb-1)

BsrarrK+ ndash 7200+-2200 (BR)

1770+-310

Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0

SM(C7C9)=439(+038-035) GeV2

sensitive to NP contribution

s = (m)2 [GeV2]

2 fb-1

A fb(s

) s0

(s0) = 05 GeV2

28

Charm amp tau

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

16

3

2

1From tree amplitudes BS DSKTime dependent CP asymmetry

From tree amplitudes BplusmnDKplusmn B0DK

ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-

GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0

Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-

From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements

angle γ

17

s

s

b

c

u

s

Bs0

Ds

K

Kndash

s

s

b

u

c

s

Bs0

Ds

bull interference between tree level decays via mixingbull insensitive to New Physics

bull Measures + 2s (s from Bs J)

bull Main background Bs Ds

bull 10 times higher branching ratio bull suppressed using PID by RICH

Channel Yield 2 fb-1 BS (90 CL)

BSDSK 62 k [008-04]

BSDS 140 k [008-03]

sif eie2

sif e

KDs

KDs)(0 tBs

)(0 tBs

)0(0sB

γ from BSDSK

18

5 years dataBsrarr Ds

-

Bsrarr Ds-K+

ms = 20)

BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs

Sensitivity at 2 fb-1

s(γ+φs) = 9ondash12o

s(ms) = 0007 ps-1

γ from BSDSK

19

ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K

Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD

Kπ~006)

Colour allowed

Double Cabbibo suppressed

Colour suppressed

Cabbibo favoured

Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects

γ from BDK

20

favoured

colour suppressed

Channel Yield (2 fb-

1)BS

B rarr D(hh) K 78 k 18

B rarr D(K) K Favoured 56 k 06

B rarr D(K) K Suppressed 071k 2

B rarr D(K3) K Favoured 62k 07

B rarr D(K3) K Suppressed 08k 2

() = 5o to 13o

depending on strong phases

Also under studyBplusmn rarr DKplusmn with D rarr Ks

Bplusmn rarr DKplusmn with D rarr KK

B0 rarr DK0 with D rarr KK K

Bplusmn rarr DKplusmn with D rarr KK K(high background)

Overall expect precision of() = 5o with 2 fb-1 of data

Dalitz analyses

()

γ from BDK

24

Rare B decays

25

BSμμ

Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9

Sensitive to NP models with S or P coupling

MSSM Br ~ tan6βMA4

bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity

(SM branching ratio) bull 01 fb-1 BR lt 10-8

bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation

26

Bsφγ

b (L) + (msmb) (R)

In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur

Measuring time-dependent CP asymmetry is a probe for NP

2sinh

2cosh

sincos

)()(

)()()(

tA

tmtAmtA

BB

BBtA mixdir

SS

SSCP

In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1

Channel Yield (2 fb-1)

BS

Bsrarr 11k lt055

Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)

27

BdKμμ

bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now

Channel Yield (2 fb-1) BG (2 fb-1)

BsrarrK+ ndash 7200+-2200 (BR)

1770+-310

Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0

SM(C7C9)=439(+038-035) GeV2

sensitive to NP contribution

s = (m)2 [GeV2]

2 fb-1

A fb(s

) s0

(s0) = 05 GeV2

28

Charm amp tau

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

17

s

s

b

c

u

s

Bs0

Ds

K

Kndash

s

s

b

u

c

s

Bs0

Ds

bull interference between tree level decays via mixingbull insensitive to New Physics

bull Measures + 2s (s from Bs J)

bull Main background Bs Ds

bull 10 times higher branching ratio bull suppressed using PID by RICH

Channel Yield 2 fb-1 BS (90 CL)

BSDSK 62 k [008-04]

BSDS 140 k [008-03]

sif eie2

sif e

KDs

KDs)(0 tBs

)(0 tBs

)0(0sB

γ from BSDSK

18

5 years dataBsrarr Ds

-

Bsrarr Ds-K+

ms = 20)

BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs

Sensitivity at 2 fb-1

s(γ+φs) = 9ondash12o

s(ms) = 0007 ps-1

γ from BSDSK

19

ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K

Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD

Kπ~006)

Colour allowed

Double Cabbibo suppressed

Colour suppressed

Cabbibo favoured

Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects

γ from BDK

20

favoured

colour suppressed

Channel Yield (2 fb-

1)BS

B rarr D(hh) K 78 k 18

B rarr D(K) K Favoured 56 k 06

B rarr D(K) K Suppressed 071k 2

B rarr D(K3) K Favoured 62k 07

B rarr D(K3) K Suppressed 08k 2

() = 5o to 13o

depending on strong phases

Also under studyBplusmn rarr DKplusmn with D rarr Ks

Bplusmn rarr DKplusmn with D rarr KK

B0 rarr DK0 with D rarr KK K

Bplusmn rarr DKplusmn with D rarr KK K(high background)

Overall expect precision of() = 5o with 2 fb-1 of data

Dalitz analyses

()

γ from BDK

24

Rare B decays

25

BSμμ

Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9

Sensitive to NP models with S or P coupling

MSSM Br ~ tan6βMA4

bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity

(SM branching ratio) bull 01 fb-1 BR lt 10-8

bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation

26

Bsφγ

b (L) + (msmb) (R)

In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur

Measuring time-dependent CP asymmetry is a probe for NP

2sinh

2cosh

sincos

)()(

)()()(

tA

tmtAmtA

BB

BBtA mixdir

SS

SSCP

In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1

Channel Yield (2 fb-1)

BS

Bsrarr 11k lt055

Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)

27

BdKμμ

bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now

Channel Yield (2 fb-1) BG (2 fb-1)

BsrarrK+ ndash 7200+-2200 (BR)

1770+-310

Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0

SM(C7C9)=439(+038-035) GeV2

sensitive to NP contribution

s = (m)2 [GeV2]

2 fb-1

A fb(s

) s0

(s0) = 05 GeV2

28

Charm amp tau

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

18

5 years dataBsrarr Ds

-

Bsrarr Ds-K+

ms = 20)

BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs

Sensitivity at 2 fb-1

s(γ+φs) = 9ondash12o

s(ms) = 0007 ps-1

γ from BSDSK

19

ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K

Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD

Kπ~006)

Colour allowed

Double Cabbibo suppressed

Colour suppressed

Cabbibo favoured

Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects

γ from BDK

20

favoured

colour suppressed

Channel Yield (2 fb-

1)BS

B rarr D(hh) K 78 k 18

B rarr D(K) K Favoured 56 k 06

B rarr D(K) K Suppressed 071k 2

B rarr D(K3) K Favoured 62k 07

B rarr D(K3) K Suppressed 08k 2

() = 5o to 13o

depending on strong phases

Also under studyBplusmn rarr DKplusmn with D rarr Ks

Bplusmn rarr DKplusmn with D rarr KK

B0 rarr DK0 with D rarr KK K

Bplusmn rarr DKplusmn with D rarr KK K(high background)

Overall expect precision of() = 5o with 2 fb-1 of data

Dalitz analyses

()

γ from BDK

24

Rare B decays

25

BSμμ

Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9

Sensitive to NP models with S or P coupling

MSSM Br ~ tan6βMA4

bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity

(SM branching ratio) bull 01 fb-1 BR lt 10-8

bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation

26

Bsφγ

b (L) + (msmb) (R)

In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur

Measuring time-dependent CP asymmetry is a probe for NP

2sinh

2cosh

sincos

)()(

)()()(

tA

tmtAmtA

BB

BBtA mixdir

SS

SSCP

In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1

Channel Yield (2 fb-1)

BS

Bsrarr 11k lt055

Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)

27

BdKμμ

bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now

Channel Yield (2 fb-1) BG (2 fb-1)

BsrarrK+ ndash 7200+-2200 (BR)

1770+-310

Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0

SM(C7C9)=439(+038-035) GeV2

sensitive to NP contribution

s = (m)2 [GeV2]

2 fb-1

A fb(s

) s0

(s0) = 05 GeV2

28

Charm amp tau

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

19

ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K

Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD

Kπ~006)

Colour allowed

Double Cabbibo suppressed

Colour suppressed

Cabbibo favoured

Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects

γ from BDK

20

favoured

colour suppressed

Channel Yield (2 fb-

1)BS

B rarr D(hh) K 78 k 18

B rarr D(K) K Favoured 56 k 06

B rarr D(K) K Suppressed 071k 2

B rarr D(K3) K Favoured 62k 07

B rarr D(K3) K Suppressed 08k 2

() = 5o to 13o

depending on strong phases

Also under studyBplusmn rarr DKplusmn with D rarr Ks

Bplusmn rarr DKplusmn with D rarr KK

B0 rarr DK0 with D rarr KK K

Bplusmn rarr DKplusmn with D rarr KK K(high background)

Overall expect precision of() = 5o with 2 fb-1 of data

Dalitz analyses

()

γ from BDK

24

Rare B decays

25

BSμμ

Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9

Sensitive to NP models with S or P coupling

MSSM Br ~ tan6βMA4

bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity

(SM branching ratio) bull 01 fb-1 BR lt 10-8

bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation

26

Bsφγ

b (L) + (msmb) (R)

In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur

Measuring time-dependent CP asymmetry is a probe for NP

2sinh

2cosh

sincos

)()(

)()()(

tA

tmtAmtA

BB

BBtA mixdir

SS

SSCP

In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1

Channel Yield (2 fb-1)

BS

Bsrarr 11k lt055

Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)

27

BdKμμ

bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now

Channel Yield (2 fb-1) BG (2 fb-1)

BsrarrK+ ndash 7200+-2200 (BR)

1770+-310

Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0

SM(C7C9)=439(+038-035) GeV2

sensitive to NP contribution

s = (m)2 [GeV2]

2 fb-1

A fb(s

) s0

(s0) = 05 GeV2

28

Charm amp tau

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

20

favoured

colour suppressed

Channel Yield (2 fb-

1)BS

B rarr D(hh) K 78 k 18

B rarr D(K) K Favoured 56 k 06

B rarr D(K) K Suppressed 071k 2

B rarr D(K3) K Favoured 62k 07

B rarr D(K3) K Suppressed 08k 2

() = 5o to 13o

depending on strong phases

Also under studyBplusmn rarr DKplusmn with D rarr Ks

Bplusmn rarr DKplusmn with D rarr KK

B0 rarr DK0 with D rarr KK K

Bplusmn rarr DKplusmn with D rarr KK K(high background)

Overall expect precision of() = 5o with 2 fb-1 of data

Dalitz analyses

()

γ from BDK

24

Rare B decays

25

BSμμ

Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9

Sensitive to NP models with S or P coupling

MSSM Br ~ tan6βMA4

bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity

(SM branching ratio) bull 01 fb-1 BR lt 10-8

bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation

26

Bsφγ

b (L) + (msmb) (R)

In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur

Measuring time-dependent CP asymmetry is a probe for NP

2sinh

2cosh

sincos

)()(

)()()(

tA

tmtAmtA

BB

BBtA mixdir

SS

SSCP

In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1

Channel Yield (2 fb-1)

BS

Bsrarr 11k lt055

Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)

27

BdKμμ

bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now

Channel Yield (2 fb-1) BG (2 fb-1)

BsrarrK+ ndash 7200+-2200 (BR)

1770+-310

Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0

SM(C7C9)=439(+038-035) GeV2

sensitive to NP contribution

s = (m)2 [GeV2]

2 fb-1

A fb(s

) s0

(s0) = 05 GeV2

28

Charm amp tau

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

24

Rare B decays

25

BSμμ

Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9

Sensitive to NP models with S or P coupling

MSSM Br ~ tan6βMA4

bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity

(SM branching ratio) bull 01 fb-1 BR lt 10-8

bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation

26

Bsφγ

b (L) + (msmb) (R)

In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur

Measuring time-dependent CP asymmetry is a probe for NP

2sinh

2cosh

sincos

)()(

)()()(

tA

tmtAmtA

BB

BBtA mixdir

SS

SSCP

In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1

Channel Yield (2 fb-1)

BS

Bsrarr 11k lt055

Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)

27

BdKμμ

bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now

Channel Yield (2 fb-1) BG (2 fb-1)

BsrarrK+ ndash 7200+-2200 (BR)

1770+-310

Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0

SM(C7C9)=439(+038-035) GeV2

sensitive to NP contribution

s = (m)2 [GeV2]

2 fb-1

A fb(s

) s0

(s0) = 05 GeV2

28

Charm amp tau

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

25

BSμμ

Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9

Sensitive to NP models with S or P coupling

MSSM Br ~ tan6βMA4

bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity

(SM branching ratio) bull 01 fb-1 BR lt 10-8

bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation

26

Bsφγ

b (L) + (msmb) (R)

In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur

Measuring time-dependent CP asymmetry is a probe for NP

2sinh

2cosh

sincos

)()(

)()()(

tA

tmtAmtA

BB

BBtA mixdir

SS

SSCP

In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1

Channel Yield (2 fb-1)

BS

Bsrarr 11k lt055

Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)

27

BdKμμ

bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now

Channel Yield (2 fb-1) BG (2 fb-1)

BsrarrK+ ndash 7200+-2200 (BR)

1770+-310

Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0

SM(C7C9)=439(+038-035) GeV2

sensitive to NP contribution

s = (m)2 [GeV2]

2 fb-1

A fb(s

) s0

(s0) = 05 GeV2

28

Charm amp tau

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

26

Bsφγ

b (L) + (msmb) (R)

In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur

Measuring time-dependent CP asymmetry is a probe for NP

2sinh

2cosh

sincos

)()(

)()()(

tA

tmtAmtA

BB

BBtA mixdir

SS

SSCP

In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1

Channel Yield (2 fb-1)

BS

Bsrarr 11k lt055

Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)

27

BdKμμ

bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now

Channel Yield (2 fb-1) BG (2 fb-1)

BsrarrK+ ndash 7200+-2200 (BR)

1770+-310

Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0

SM(C7C9)=439(+038-035) GeV2

sensitive to NP contribution

s = (m)2 [GeV2]

2 fb-1

A fb(s

) s0

(s0) = 05 GeV2

28

Charm amp tau

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

27

BdKμμ

bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now

Channel Yield (2 fb-1) BG (2 fb-1)

BsrarrK+ ndash 7200+-2200 (BR)

1770+-310

Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0

SM(C7C9)=439(+038-035) GeV2

sensitive to NP contribution

s = (m)2 [GeV2]

2 fb-1

A fb(s

) s0

(s0) = 05 GeV2

28

Charm amp tau

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

28

Charm amp tau

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

29

2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50

MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)

D0s are flavor tagged with π from D decay

Two sources of D0s in LHCb from B decays

favoured by LHCb triggers prompt production in primary interaction

Estimated annual yields (per 2 fb-1) from B decays

D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt

production

Dedicated D trigger

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

30

LHCb prospects for Charm physics studies

D0 mixing

Time-dependent D0 mixing with wrong-sign D0K+π- decays

Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)

Lifetime ratio mean lifetime (DK-

π+) and CP even decay DK+K-(π+π-)

yCP=y in absence of CP violation (φ=0)

2

2121 yMM

x

The mixing has been recently observed (Belle BaBar CDF)

x = 089plusmn 026027

y = 075plusmn 017018

LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4

2

1sincos1

)(

)( 2

_0

0m

CP

Rxy

KKD

KDy

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

31

LHCb prospects for Charm physics studies

Direct CP violation can be measured in D0KK lifetime asymmetry

ACPlt10-3 in SM up to 1 with New Physics

current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023

LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

32

Present upper limit

Br(τ3μ) lt 3210-8 90CL (Belle)

Br(τ3μ) lt 5310-8 90CL (BaBar)

σ=86 MeV

τ3μ background

Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8

The result is not final background estimate may change event selection refined

τ3μ (preliminary)

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

33

Upgrade issues

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

34

Sensitivities for 100 fb-1

Also studying Lepton Flavour Violation in

10 fb-1 will be collected by 2013

bull φS measured to 0023

bull γ to 2 - 5o

bull BS μμ observed at 5σ level

bull many more excellent physics results

next step ndash collect 100fb-

1

Probemeasure NP at level

bull have to work at gt 1033cm-2s-

1

bull upgrade is necessary

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

35

bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1

bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity

bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1

bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm

LHC schedule

bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013

bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017

LHCb at higher luminosity

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

36

the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout

bull perform also necessary upgrade of subdetectors

bull replace readout chips in the vertex detector (VELO)

bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors

bull Tracking system replace all Si sensors as readout chips are bonded on hybrids

bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1

in 2017 upgrade the subdetectors for gt21033 cm-2s-1

bull fully rebuild vertex detector (pixels or 3D)

bull rebuild Outer Tracker replace central part of EM calorimeter hellip

bull run at highest possible luminosity for 5 years

LHCb upgrade strategy

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

37

Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data

bull key measurements with 2009 data

bull βS precision ~004

bull BSμμ sensitivity ~ SM expectations

bull Full physics program in 2010-2013 at 10 fb-1

bull Angle γ precision of ~5o with 2 fb-1

bull search for New Physics in photon polarization in bsγ

bull precision measurement of AFB in BKμμ

bull Charm physics D0 mixing direct CP violation in D0KK(ππ)

bull and much morehellip

bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

38

Backup

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23

39

τ3μ Event selection

cuts per track

PT gt 04 GeV

IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3

Background rejection 4910-9

Per 2 fb-1 ~2200 bg evts expected

FeldmanCousins upper limit 785 ev

Corresponds to Br limit 61 10-8

Main source of τ DS decays

Per 2 fb-1 561010 τ produced

Signal efficiency 23