atlas and cms activities
DESCRIPTION
ATLAS and CMS activities. Albert De Roeck CERN. ECFA/DESY meeting St Malo 12-15 April 2002. LHC Prospects. New date for first beams/collisions: 1/4/2007 Initial physics run starts in 2007 ~10 fb -1 (2.10 33 cm -2 s -1 ) - PowerPoint PPT PresentationTRANSCRIPT
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LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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ATLAS and CMS activities
Albert De RoeckCERN
ECFA/DESY meeting St Malo 12-15 April 2002
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LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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LHC Prospects• New date for first beams/collisions: 1/4/2007• Initial physics run starts in 2007 ~10 fb-1 (2.1033cm-2 s-1)• Depending on the evolution: 200-300 fb-1 in 5-6 years (3.4-10.1033cm-2 s-1 )• Studies ongoing for 1.1035cm-2 s-1 (SLHC)
– Needs changes in machine and detectors ~3000 fb-1 in 3-4 years, i.e. by the end of 2010 or so
• CMS & ATLAS preparing for first beam in 2007– Concentrate on hard & software– Main questions are on trigger/DAQ, using gold plated physics
channels– Exploring of new physics studies not main activity now Discovery potential has been demonstrated for key processes
• Planned/existing physics review studies– ATLAS physics TDR exist since 2000, may be redone in 2005– CMS physics TDR planned for 2005, starting to prepare during
2002
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LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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ATLAS and CMS Plans• Common LC/LHC studies
– There is interest but not yet much activity (5-10 people/exp for now)
– We need to start with a fewspecific questions/studies– (Agree on luminosities etc.)
• ATLAS: Global fits using masses of measured particles, to scan and constrain the susy space Expect gain due to sleptons on M0
Add branching ratio & cross section measurements Will be initially based on the ‘old’ LHC benchmark points CMS: interest to start such activity/using new benchmark points
• ATLAS & CMS: check on gain of precise measurements of 01 (and
other gaugino’s) for reconstructing squark masses (mass splitting)• CMS: Combining heavy higgs (LHC) with light higgs (LC)
measurement
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LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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ATLAS and CMS Plans• Benchmark points
– ATLAS: so far study of point E(*) (SPS 2(**)), maybe B (SPS 1a) next
– CMS: point B, C (SPS 3) , E and G for trigger studies and reconstruction points I,L (SPS 4) for heavy Higgs to Tau
( point I could be replaced by SPS1b )– SLHC study: points M, K, H used (no SPS equivalent)– Non-mSUGRA models: take SPS selected points
• CMS: Combined studies of extra dimensions ?
Plan for first results end of June
In the following:• A reminder of LHC reach, relevant for this group• New studies in CMS, e.g. on susy mass reconstruction
(*) BDEGMOPW points (**) Snowmass points & slopes
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Example: LSP from LCImpact of the precise knowledge of the LSP from the LC on the neutralino two and slepton masses
LSP mass LSP mass
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CMS
Visiting IP5… CMS getting into shape
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Example: The CMS experimento Tracking
o Silicon pixelso Silicon strips
o Calorimeterso PbW04 crystals for Electro-magn.o Scintillator/copper for hadronic part
o 4T solenoido Instrumented iron for muon detection
o Jet Energy scale to 1.0%o EM energy scale to 0.1%o Luminosity to better than 5%
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LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Expected Event rates
0.001 104
(m=1 TeV) H 0.001 104
(m=0.8 TeV)
Process Events/s Events/year Other machines
W e 15 108 104 LEP / 107 Tev
Z ee 1.5 107 107 LEP
0.8 107 104 Tevatron
105 1012 108 Belle/BaBar
QCD jets 102 109 107 pT > 200 GeV
gg~~
tt
bb
Huge event rates:
The LHC will bea W-factory, aZ-factory, a topfactory, a Higgsfactory etc..
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SM Higgs search
Production and decay modes:
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Expected Results for the Higgs
- Will discover the Higgs in the range 100 GeV 1 TeV (if exists)- Precision on the measurement of the mass between 0.1-1%
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H ZZ(*) 4 leptons
• clean signal, mass resolution 1%• precision on muon momentum comes from combining muon chamber with tracker info
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Light Higgs search
If mh < 140 GeV : gg h most promising channel, although BR only 10-3 …
motivation for high resolution ECAL (PbWO4 crystals: 1% at 100 GeV)
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Light Higgs search
Recent: h bb in tth production _
Also results on H
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Hgap gap
b
b -jet
-jet
Exclusive Higgs
A recent development: search for exclusive Higgs production pp p H p
p p
beam
p’
p’
dipoleroman pots
Needs roman pots
Cross section ~ 1 fb Khoze et al.
roman pots
dipole
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Invisible Higgs
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Heavy Higgs
Working hard to cover low tan - high mA region …
COVERED• at large tan , bb A/H and tb H production strongly enhanced!!
• assume Msusy = 1 TeV
• important channels:• A/H • A/H • H • H tb
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Heavy MSSM Higgs search (3)
F. Moortgat
NEW: at low tan , we may exploit the sparticle decay modes:
A, H 20 2
0 4l + ETmiss
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Susy measurements
Atlas physics TDR
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Susy
Mostly complicated decay chains
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Susy
Decay chain example
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Susy discovery LimitsS. Abdoulin
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Susy measurementsAtlas physics TDR: LHC Point 5
m0=100 GeV m1/2=300 GeV tan = 2.1sgn()=+A=300 GeV
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Susy measurementsAtlas physics TDR
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LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Benchmark points
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LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Benchmark Points
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99.610 = LSP
186.01±145.8lR
379.72±211.4lL
186.820549qR
358.830570qL
379.140549.7bR
600.5tR522.5bL
412.5tL643.3g
pb 41.41TOTSUSY
Study of point B (SPS1)M. Chiorboli
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LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Decay chain
p
p
g~
b~
b
b
01
~
02
~ ~
0A
)( sign
10β tan
100m
250m
0
0
21
bb~
g~ pp
b~02
01~
(15% bL, 10% bR)
(35 % bL, 22% bR)
(0.2 %)
01
~ ~
(60 %)
Event final state:
• 2 high pt isolated leptons OS
• 2 high pt b jets
• missing Et
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LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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First step: 20 l+l- 1
0
02
~ 01
~
~p
p
g~
b~
b
b
01
~
02
~ ~
GeV 85.32 M
)M)(MM(MM
2
χ
222
χmax01
02
~
~~~~
GeV 1.64 86.00 Mmax
Fit result:
)μM(μ )eM(e -
)μM(e -)μM(e - )μM(μ )eM(e -- Etmiss > 50 GeV
10 fb-1
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LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Sbottom reconstruction
p
p
g~
b~
b
b
01
~
02
~ ~
Assuming M(10)
known!
p
M
M1p
01
02
~
~
GeV 92 M GeV 75
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Sbottom mass
55.8
GeV 8.1516.4b)~M( 02
Result of fit:
GeV 7.549)b~
M(
GeV 5.522)b~
M(
R
L
Generated masses:
10 fb-1
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LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Gluino reconstruction
p
p
g~
b~
b
b
01
~
02
~ ~
b)b~
( angle
Etmiss > 150 GeV
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Gluino mass
9.54σ
GeV 7.2631.8bb)χ~M( 02
Result of fit:
GeV 643.3)gM( ~Generated mass:
10 fb-1
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with 60 fb-1
60 fb-1
0.37σ
GeV 3.50.99b)χ~M(bb)χ~M( 02
02
Result of fit:
)bM(-)gM(~~ )bM(-)gM(~~
GeV 6.93)b~
M(-)g~M(
GeV 8.120)b~
M(-)g~M(
R
L
Generated values:
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152.510 = LSP
294.51±193.4lR
546.12±299.6lL
294.820780qR
532.430814qL
545.340771.3bR
800.8tR723.0bL
589.4tL919.8g
Point G
pb 6.00TOTSUSY
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Sbottom peak
6.82
GeV 8.743b)~M( 02
Result of fit:
GeV 3.771)b~
M(
GeV 0.723)b~
M(
R
L
Generated masses:
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Guino peak
7.31σ
GeV 1.909bb)χ~M( 02
Result of fit:
GeV 8.199)g~M(
Generated mass:
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estimation
This needs better understanding of the SM bkg behaviour!
27.9σ
GeV 5.7168.1b)χ~M(bb)χ~M( 02
02
Result of fit:
)bM(-)gM(~~ )bM(-)gM(~~
GeV 5.148)b~
M(-)g~M(
GeV 8.196)b~
M(-)g~M(
R
L
Generated values:
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LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Conclusions
Point G, with 60 fb-1
• Sbottom and gluino seem to be visible
• estimation of M(l+l-)max
• sbottom reconstruction with Resol. ~ 10 %, but 2 sbottoms not resolved
• gluino reconstruction with Resol. < 10 %
• M(g) - M(b) estimation, independent of M(10), with Err ~ 4 %
Point B, with 10 fb-1
~2~
2~
2~
2~ M)MM)(MM( 0
102
• Maybe we can separate the 2 sbottoms
Point B, with 60 fb-1
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Stop Searches
Stop mass and cross sectionMissing ET and transverse l mass
S/B forSM andSM+SUSY
Channels
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Rare Top Decays
S. Slabospitskydecay production
t ugt cg
1.6 10-3
1.6 10-3
(0.35.) 10-3
(2.122.) 10-3
tutc
2.5 10-5
2.5 10-5
0.4 10-5
3.5 10-5
tuZtcZ
1.6 10-4
1.6 10-4
1.1 10-4
4.8 10-4
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Graviton SearchesTraczyk, Wrochna
KK excitations in the RS model
Search Reach
MG=1000 GeVC=0.01
MG=2000 GeVC=0.01
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physics
• observation: provided efficient measurement of forward scattered protons, one can study high-energy collisions at the LHC
p p
Highlights:• CM energy W up to/beyond 1 TeV (and under control) • Large photon flux F therefore significant luminosity• Complementary (and clean) physics to pp interactions, eg studies of exclusive production of the Higgs boson, W pairs might be possible opens new field of studying very high
energy physics
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Two-photon interactions at the LHC
pp
October 2001 K.Piotrzkowski, Erice Workshop
Physics Menu - Highlights
H0
pb (at W=MH=200 GeV)
pb
tt
pb
nb
All ?
W+W-
+ SUSY processes
+ total cross section ….
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physics
H0
pb (at W=MH=200 GeV)
SUSY: Higgs:
clean signatures: both transversal and longitudinal missing energy !
it cannot be missed!!
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And more…-Precision measurements MW to 15 MeV, Mtop to 1.5 GeV anomalous gauge couplings, sin2W, rare top decays, B-physics, CP violation studies-MSSM Higgs bosons-Extra dimensions-New heavy gauge bosons-Strong interactions in the W sector-Technicolor-Compositeness up to scales of 40 TeV
LHC detectors must be preparedfor the unknown
MSSM Higgs
W massNew W boson
Top quark mass