Tevatron Status and Physics Perspectives

1
Tevatron Status and Physics Perspectives

• D.Glenzinski
• Fermilab
• 19-May-2008

2
Outline

• Introduction
• Status of the machine
• Status of the experiments
• Physics Results
• Conclusions

3
Fermilab Tevatron
4
Tevatron Run I

• Top Quark discovered in 1995
• CDF and D0 jointly
• Each uncovered 20 t-tbar events in 60 pb-1
• With full Run 1 dataset
• 35 t-tbar events /exp
• Full set of top properties explored

5
Tevatron RunII Performance
2008
2007
2006
2005
2004
2003
2002

• Doubled dataset each year for four years
• Expect 1.5-2.0 fb-1 per year in gt2007

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Tevatron Performance
Average Anti-Proton stack rate

• Anti-Protons
• Doubled stacking rate over last two years
• No longer limiting factor

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Tevatron Anti-Protons

• Making anti-protons is a tough business
• p Ni ? p p p pbar X
• 1 anti-proton / 60k protons
• We collect 2x1011 pbar/hour

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Tevatron Performance
Average Anti-Proton stack rate

• Anti-Protons
• Doubled stacking rate over last two years
• No longer limiting factor
• Complex up time
• 20 years old
• Exceeding original design specs by x300
• Constant vigilance required

Luminosity delivered/experiment/week
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Tevatron Accelerator Complex

• Need entire complex working well to consistently
  deliver high luminosity runs

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Tevatron Luminosity Projection

• Will reach 6.5 fb-1 / experiment by end 2009
• A 2010 run would bring that to 8 fb-1 each

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Tevatron Experiments
CDF
D0

• Two experiments CDF and D0
• Multipurpose collider detectors
• International collaborations, 600 members each

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CDF Detector

• Features
• Precision silicon vertexing
• Large radius drift chamber (r1.4m)
• 1.4 T solenoid
• projective calorimetry
• (? lt 3.5)
• muon chambers
• (? lt 1.0)
• Particle identification
• Silicon Vertex Trigger

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DZero (D0) Detector

• Features
• Precision silicon vertexing
• Outer fiber tracker
• (r0.5m)
• 2.0 T solenoid
• hermetic calorimetry
• (? lt 4)
• muon chambers
• (? lt 2.0)
• New trigger and more silicon in Summer 2006
  (Run2b)

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Detector Performance

• CDFD0 stable operations since 2002
• Experiments keeping-up with luminosity
• No known problems in foreseeable future

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Physics Productivity

• A Tevatron publication or thesis every 2.5 days
• CDF and D0 each publishing 35 papers/year

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Physics Program

• QCD
• Heavy Flavor
• Electroweak
• Top Quark
• New Phenomena

• Unique capabilities
• Energy Frontier
• Bs, Bc, b-baryons
• LHC groundwork
• Top Quarks

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Inclusive Jet Cross Sections

• Agreement with QCD over wide kinematic range
• Most precise measurements to date
• Provides constraints on PDFs

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W-Charge Asymmetry

• Constrains PDFs in LHC relevant region

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Jet Shapes and UE

• Fragmentation and Underlying Event well modeled

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VJets Processes

• Several theory groups have made Vhf calculations
• Mangano, et al., at LO original motivation for
  ALPGEN (hep-ph/0108069)
• Campbell, Ellis, Maltoni, Willenbrock at NLO
  using MCFM (hep-ph/0611348)
• These calculations are hard to get right
• At LO both Vbb and Vbq are important
• Large NLO enhancements (e.g. x2 for Wb)
• Experimental feedback important for Tevatron and
  LHC
• Vhf important backgrounds to ttbar, single-top,
  higgs

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Zjets Cross Section

• Good agreement with NLO predictions

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Zhf Cross Section

• Sensitive to b-quark density in proton
• Important background for Higgs, single-top,
• Measure b fraction by fitting mass at
• secondary vertex.
• Updated results now have differential
• distributions in jet ET, eta, Z PT, Njets
  ,Nb-jets
• Significant variations among theory predictions
• with 2 fb-1, data statistically inconclusive but
  prefer Pythia at low ET and Alpgen/NLO at high
  ET need more data to differentiate

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Whf Cross Section
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Whf cross section

• Wc, important in 1-j and 2-j (e.g. higgs,
  single-top)
• Ratio(obs) 7.7 /- 1.7
• Ratio(AlpgenPyt) 4.0 /- 1.2

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Spectroscopy
mass determination

• Made first observations of several b-hadrons
• Program of determining their masses, lifetimes,
  etc
• Together make nice test of HQET/Lattice

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Precision Bs Lifetime

• Recent determination of Bs lifetime using
  hadronic decays
• Fit fullypartially reconstructed
  decays

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Precision Bs Lifetime

• Ratio of lifetimes interesting
• Theory
• PDG07
• Single most precise
• This
• Control samples

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Direct CP Violation in B

• CPV in SM due to different complex phases
• New Physics may alter the measured phases
• J/?K improves WA by x2

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CPV in Bs System

• CP-Violation in Bs system unconstrained by Bd
  measurements

• Expected to be small in SM (?s???s-0.04)
• Small New Physics effects can have large impact

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CPV in Bs System
CDF 1.35 fb-1 2k Bs candidates

• Bs -gt J/??? not a pure CP eigenstate
• Time dependent angular analysis required to
  separate CP-even and CP-odd components
• Builds from B-mixing techniques (e.g. flavor
  tagging)

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Angular Analysis in Bd

• Use Bd-gtJ/? K decays
• Perform time-dependent angular analysis
• Measure relative phases and amplitudes
• Compare to B-factory measurements
• Important cross-check of method
• Competitive with B-factories

Parameter CDF BaBar hepex07040522
A02 0.569 0.009 0.009 0.556 0.009 0.010
A2 0.211 0.012 0.006 0.211 0.010 0.006
?-?0 -2.96 0.08 0.03 -2.93 0.08 0.04
??-?0? 2.97 0.06 0.01 2.91 0.05 0.03
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CPV in Bs System
CDF 1.35 fb-1

• SM p-value D07 CDF15
• D0 constrains strong phases assuming SU(3)
  symmetry, CDF unconstrained
• Work ongoing to combine (un)constrained results

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A Crack in the SM?
4 of 6 inputs unique to Tevatron, 6 of 6 include
Tevatron results.

• CDF and D0 will continue to have a very active
  heavy flavor program --- many measurements stats
  limited

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DiBosons and TGC

• Exploring Triple Gauge Couplings (TGC) with WW,
  WZ, ZZ, W?, and Z??samples
• Neutral couplings ZZZ, ZZ???Z????(better than
  LEP2)
• Charged couplings WWZ, WW? (complimentary to
  LEP2)
• Gauge structure of SM very constraining
• Deviation unambiguous signal of New Physics
• With 2 fb-1 reach LEP2 sensitivities
• All channels statistically limited

CDF 2 fb-1 LEP 2
h3Z 0.083 (-0.2,0.07)
h4Z 0.0047 (-0.05,0.12)
h3? 0.084 (-0.049,0.008)
h4? 0.0047 (-0.02,0.034)
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Precision W mass

• CDF Run II worlds best using only 200 pb-1 of
  data
• Both experiments aiming for new results at ICHEP
• With 2 fb-1 CDF extrapolates to ?Mw25 MeV/c2,
  comparable to present world avg D0 will be
  similar

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Precision Top Quark Mass

• Precision Mt, Mw cornerstones of our EWK program
• New Mt results ( ) in all three channels
• ?Mt1.4 GeV/c2 (0.8)
• x2 better than Run2 goal
• Working to improve understanding of dominant
  systematic uncertainties
• Could reach 1 GeV/c2

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Mt and MW and MH

• Prefers light higgs mass where TeV has
  sensitivity

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SM Higgs Production

• For MH140-110 ?(WHZH)100-300 fb
• For MH180-140 ?(gg?H)150-500 fb

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SM Higgs Decay

• Most important decays
• Low mass
• High mass

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Higgs Experimental Signatures

• Most important at Low mass
• Signature determined by W, Z decays
• Most important at High mass
• Leptonic W decays dominant
• Some sensitivity also from WH production
• Each experiment has results in all these final
  states

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Higgs Experimental Signatures

• Additional channels now being added

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SM Higgs Search

• New channel (V)H--gt ??qq
• Sensitive to all major production mechanisms
• WH, ZH, ggH, Vector-Boson-Fusion
• Inclusion improved CDF sensitivity by 10

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SM Higgs Search

• Require one ?--gte or ?, the
• other ?--gthadronic
• 2 jets Etgt15 GeV, ?lt2.5
• Rigorously optimized
• Investigated 16 NN
• and their combinations
• Rigorously cross-checked
• Bgd in 0j and 1j bins
• Signal in Z--gt??

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Tevatron Combined Higgs Limits
MH115 GeV/c2 Exp 3.3 Obs 3.7
MH160 GeV/c2 Exp 1.6 Obs 1.1
arXiv/0804.3423 hep-ex
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Higgs Sensitivity

• Our sensitivity is improving faster than
  1/sqrt(L)
• Weve lots of ideas and were implementing them!

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Higgs Sensitivity

• Our sensitivity is improving faster than
  1/sqrt(L)
• Weve lots of ideas and were implementing them!

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Tevatron Higgs Reach

• We can eliminate all MHlt180 GeV/c2
• or get first glimpse if 150ltMHlt170 GeV/c2

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Tevatron Higgs Reach

• Some comments
• The lines in the previous plot represent the 50th
  percentile of pseudo-experiments can get lucky
  or unlucky
• 3? evidence possible, even likely, if MH in right
  range and enough luminosity
• In the absence of evidence, resulting CL limits
  more stringent that 95 over most MHlt180
• Seriously strains the SM
• Eliminates large (and popular) class of SuSy
  models (because they require lowest M?lt140 GeV/c2)

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Tevatron Hunt for the Higgs

• Were taking this very seriously

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Search for New Phenomena

• Occupying the energy frontier means the Tevatron
  experiments have the worlds best sensitivity to
  many different New Physics models and signatures

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Search for New Phenomena

• No significant deviations from SM
• but not for lack of trying
• Thorough program looking for BSM
• Over next two years expect another
• factor 4 or more in data

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Closing Remarks

• Tevatron performing well
• 4 fb-1/experiment in hand
• Expect 6-8 fb-1/experiment by end RunII
• CDF and D0 performing well
• Publishing wide spectrum of world class results
  (Tevatron 2007 avg 1 publication / 5 days)
• Ready to take advantage of coming data
• Enthusiastically pursuing New Physics and Higgs

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Closing Remarks

• The LHC will inherit
• Precise determination of ?ms and constraints on
  CP phase in Bs sector ?Bs
• Precision Mt (?Mt?1.0-1.5 GeV/c2) and
• Mw (?Mw15-25 MeV/c2)
• A more restricted New Physics parameter space

• A higgs mass

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Backup

• Backup slides follow

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CDF SM Higgs Limit
MH115 GeV/c2 Exp 4.6 Obs 4.9
MH160 GeV/c2 Exp 2.5 Obs 1.7
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D0 Higgs Limit
MH 160 GeV Exp. 2.4 Obs. 2.2
MH 115 GeV Exp. 5.5 Obs. 6.4