Lp2005

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Lp2005
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lp2005
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Top Mass Measurements
dilepton new
MtopCDF 172.2 3.7 GeV (2 accuracy)
2 papers submitted, 3 papers in preparation
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Top Mass and Production Cross-section
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new high energy effects with scale L must control
the higgs mass

• scale of new physics from the requirement that
  the radiative corrections to the higgs mass are
  small

d

tension with accuracy of the Standard Model
Mh115 GeV
Veltman condition (I get 311)
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Higgs

• Promising and a 2s fluctuation where LEP
  fluctuated and Veltman Condition satisfied.
• MSSM? NMSSM speculation?
• HARD to measure because need to do the b jet
  energy scale right.

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Need z-gtbbbar, clustering
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W Jets 2 jet bin is the Signal, 1,3,4 measured
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Single Tag
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Double tag
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Set limits
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Future
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All channels as they are, 0.36 fb-1
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For all higgstrallung at Tev
Service work
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H-gtWW and VBF
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Diboson Production

• WW production is the dominant background
• Compulsory to first measure the WW production
  cross-section
• Select a large WW sample to check
• Simulation modelling of the data (PYTHIA,
  ALPGEN), ex Df(l,l)
• Trigger, lepton identification efficiencies,
  everything comes into the mix
• Still statistically limited

PRL 94, 211801 (2005) (CDF)
S/B 2
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Event Selection

• Optimized for the best a-priori 95 C.L. on
  sxBR(H?WW)
• Two leptons
• pT trigger, non-triggergt(20,10) GeV
• Muons hlt1.0 electrons (hlt1.0, hlt2.0)
• Mll gt 16 GeV
• Jet veto (signal can only have soft ISR jets)
• 0jet 15ltET1jetlt55 GeV 15ltET2jetlt40 GeV
• jets ?lt2.5
• ET gt ¼MH
• ET gt50 GeV ??(met, closest lep/jet)gt20º
• Opposite sign
• Mll lt (½MH 5) GeV
• pT1lep1pT2lep2 ET lt MH

• Backgrounds
• rejected

Removes VBF

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H?WW contribution to the Tevatron Higgs search
x12
HWW channel is important for a MHgt130 GeV SM
Higgs discovery. Tune on Tom Junks talk for more.
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1/fb projections summary

• Assume the current analysis as starting point
• Below are just few ways we think we can use to
  improve our sensitivity

Potential Improvement
S/sqrt(B)

• Using a NN                                        
     1.42 
• Including hadronic taus                        1.1
  5
• Include associated VH and VV fusion  1.15
• Estimate performed in hep-ph/0010338
• Loose leptons                                     
     1.10

Overall
2.07
Equivalent to 4x more luminosity

• There is still potential to do better
• Not all these improvements might be ready for
  Winter conferences

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NMSSM
h-gt aa
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Claim to see signal at 110-115 (h-gtaa)
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Future
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1 fb-1 Physics Challenge (Spring-Summer 06)
Data taking Period Total Lum. (pb-1) Data processed Ntuples made Physics results
2/2002 - 8/2004 320-550 2004 2004 Spring 2005
12/2004 - 3/2005 430-680 7/2005 9/2005
3/2005 - 5/2005 540-810 8/2005 9/2005
5/2005 - 7/2005 640-910 9/2005 9/2005
7/2005 - 8/2005 700-960 10/2005 10/2005 Spring 2006
9/2005 750-1010 11/2005 11/2005
10/2005 800-1060 12/2005 12/2005
11/2005 850-1110 1/2006 1/2006
12/2005 900-1160 2/2006 2/2006
1/2006 950-1210 3/2006 3/2006
2/2006 1000-1260 4/2006 4/2006 Summer 2006
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Observations/Conclusions

• The Tevatron is coming within striking distance
  of the Higgs
• A factor of 10-20 with present data is possible
• Expect x3 or so data for winter and next summer
  (on tape, need to analyze, need to tune analysis)
• 115 GeV higgs is the hot spot
• Veltman bound
• Lep Fluctuation
• W higgstrallung fluctuation
• What can we do
• Improve bbbar resolution
• Do VBF analysis at CDF we are invited
• We learn to deal with top, underlying event, WW
  production cross section