Searching for New Physics Searching for New Physics at the Energy Frontierat the Energy Frontier

Rob Roser (Fermilab/CDF)

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OutlineOutline

• PerspectivePerspective

• HighlightsHighlights

• Outlook Outlook

CDF♦ 15 Countries♦ 63 Institutions♦ 602 authorsD0♦ 18 Countries♦ 90 Institutions♦ 533 Authors

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The CDF Experiment

The D0 Experiment

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Run 2 Luminosity Progress

Record peak inst. luminosity 3.6 E 1032 cm–2 s–1

Record luminosity/week

73 pb-1

Record luminosity/month

250 pb-1

Total Luminosity delivered

6.7 fb-1

8 years

100 times more datathan used for Top quark discovery

!

L

3.5 E 1032

L

> 2 fb-1 deliveredin 2008 !

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FY11 Luminosity Projections [delivered]

We are here

Inte

gra

ted

lu

min

osi

ty (

fb-1)

---------

FY04 FY05 FY06 FY07 FY08 FY09 FY10 FY11 FY12

~12 fb-1

Results up to ~ 5 fb-1

by Summer 09

Running through FY10 will yield 7

fb–1 of data for analysis

Running through FY11 would yield 9-10 fb–1 of data for analysis

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The Tevatron Physics ProgramThe Tevatron Physics Program Precision, new research and discoveries

Mixing, CKM Constraints, and CP-Violation

Heavy Flavor Spectroscopy

New Heavy Baryon states

Tests of QCD and HF production

Top-quark and W-boson Masses

Top quark properties

Di-Boson production and SM Gauge Couplings

New exclusive/diffractive processes

We’re addressing questions of fundamental importanceWe’re addressing questions of fundamental importance

Unique window into the unknown

Searches for Supersymmetry, Extra Dimensions, other Exotica

Still at the Energy Frontier

Probing the Terascale as luminosity increases

• The Standard Model Higgs is now within reach !

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Physics ProductionPhysics ProductionStable tools and an excellent understanding of the detectors and the data

Productivity is higher than everNear 100 new results between Summer08 and Winter09 [CDF+D0]

Still in some areas we are only scratching the surface

Much potential for further precision, reach and discovery

We need to keep exploiting the data from all angles

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Tevatron Physics Impact

Nearly 100 journal publications last year alone

About 60 Ph.D.’s / year over the last few years

About 3500 physicists have participated on the CDF and D0 experiments

CDFCDFD0D0

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Highlights&

Outlook

Highlights&

Outlook

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Discoveries: rare SM processes

2004

2006

2008 ZZ ==> mu,mu,mu,mu

Diboson production: more luminosity allows access to smaller cross sections

Diboson production: more luminosity allows access to smaller cross sections

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Recent discovery: single top

• Single Top Physics Program

• Test s vs t [new physics]

• Vtb [precision]

• Lifetime [new physics]

• Single Top Physics Program

• Test s vs t [new physics]

• Vtb [precision]

• Lifetime [new physics]

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Observation of new heavy baryons

ddb

uub

dsb

2006

2007

2009

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With more data : emergence of a new particle

2009

YY(4140)(4140)

2.7 fb-1

unknown composition

These new discoveries yield a few events/fb-1 ==> new areas of research @ 10 fb-1These new discoveries yield a few events/fb-1 ==> new areas of research @ 10 fb-1

CDF

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CDF: updated result with 2.8 fb-1

Inconsistency with SM increased(p-value from 0.15 to 0.08, corresponding to1.8 standard deviations)

More data to come, look also in otherchannels (asymmetry in semileptonicdecays)

Bs J /

Precision: CPV phase SinPrecision: CPV phase Sin(2s)

Combination of CDF and D0 results is incompatiblewith the SM at the 2.2-sigma level

Combination of CDF and D0 results is incompatiblewith the SM at the 2.2-sigma level

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Pro

ba

bili

ty o

f 5

ob

serv

atio

n

CDF only

8 fb-1

6 fb-1

s (radians) s (radians)

CDF+D¯

(assume twice CDF)

More luminosity buys more probability for discoveryand increases the sensitivity range

More luminosity buys more probability for discoveryand increases the sensitivity range

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Precision ==> Discovery possibilities

5-sigma probability vs s 5-sigma probability vs s

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Mtop = 173.1 ± 0.6(stat) ± 1.1(syst) GeV/c2Mtop = 173.1 ± 0.6(stat) ± 1.1(syst) GeV/c2

At ~10 fb-1 the top mass uncertainty is expected below 1 GeV

At ~10 fb-1 the top mass uncertainty is expected below 1 GeV

Legacy measurement: nearly impossible to beat at a hadron collider

Legacy measurement: nearly impossible to beat at a hadron collider

Precision: MtopPrecision: Mtop

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200 pb-1

1000 pb-1

Next round CDF @ 2fb-1 expect <30 MeV

uncertainty !

Next round CDF @ 2fb-1 expect <30 MeV

uncertainty !

Tevatron experiments are now best in world, will remain so for a long, long, time

Tevatron experiments are now best in world, will remain so for a long, long, time

Precision: MwPrecision: Mw

D0 Run 2 (e)

(e)

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Expected now with all constraints :

MH = 90 +36 -27 GeV MH < 163 GeV @ 95 % CL

Expected now with all constraints :

MH = 90 +36 -27 GeV MH < 163 GeV @ 95 % CL

Precision ==> Higgs constraintsPrecision ==> Higgs constraints

With 10 fb-1

If dMw=15 MeV and dMtop=1 GeV

[for Mw= 80.400] expect

MH = 71 + 24 - 19 GeV  

MH < 117 GeV @ 95% CL  !

With 10 fb-1

If dMw=15 MeV and dMtop=1 GeV

[for Mw= 80.400] expect

MH = 71 + 24 - 19 GeV  

MH < 117 GeV @ 95% CL  !

New !

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Observation of Diboson Production in ET+jj

Sensitive to WW/WZ/ZZQCD background well-modeled

Signal significance 5.3

Measure:18.0 2.8(stat) 2.4(sys) 1.1(lumi) pb

theory: 16.8 0.5 pb

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The Higgs SearchThe SM Higgs particle [if it exists] is being produced NOW at the Tevatron ! - we have enough energy

Just not that often & it’s buried in “backgrounds”

It’s a story of luminosity, passion, persistence and luck

We know how to look for it - an we are in fact closing in !

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The Higgs SearchThe SM Higgs particle [if it exists] is being produced NOW at the Tevatron ! - we have enough energy

Just not that often & it’s buried in “backgrounds”

It’s a story of luminosity, passion, persistence and luck

We know how to look for it - an we are in fact closing in !

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Higgs boson at the TevatronHiggs boson at the Tevatron

• Gluon fusion is the dominant production mode: σ ~1.1-0.1 pb• W/Z associated production next most frequent mode: σ ~0.2-0.01 pb

PRODUCTION

DECAY

Low mass

High mass

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WH lbbZH bbZH llbb

H WW ll

ZH llbbZH bbWH lbb

H WWlvlv

Total

(double including D0)

Higgs at the Tevatron

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Many channels/experiment & Large Effort

CDF + D0:

Up to 70 distinct final states !

CDF + D0:

Up to 70 distinct final states !

Decoding Limit Plots 101Decoding Limit Plots 101F

acto

r aw

ay in

sen

siti

vity

fro

m

SM

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Most recent combination CDF + D0

2.4xSM

160 GeV < MH < 170 GeV is excluded at 95% CL !160 GeV < MH < 170 GeV is excluded at 95% CL !

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no words needed

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Outlook for the Higgs Search• Recent improvements

include:

• better lepton acceptance

• smarter triggering

• More improvements in the pipeline

• Better flavor tagging

• Complementary triggers

• Tau identification

• Better jet, ET resolution

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and some luck

Higgs reach with FY11 running and continued analysis

improvement[bottom orange

band]

Higgs reach with FY11 running and continued analysis

improvement[bottom orange

band]

2-sigma

3-sigma

• Red – 5fb analyzed/expt

• Blue – 10 fb analyzed/expt

Discovery Watch Several results show

discrepancies with the SM

Are these just statistical fluctuations or the beginning of a beautiful

friendship

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t’ Search

Di- electrons

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Summary andClosing Remarks

Summary andClosing Remarks

SummaryThe Tevatron program continues to be remarkably successful

A Legacy of discoveries and extraordinary results

So far only 2 to 4 fb-1 of data analyzed

This could increase by factors of 3 to 10 with data from running through 2011

Exciting potential for future Tevatron discoveries

The Higgs is our domain for a while

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