High pt channel

1
High pt ?? channel

• Outline
• ID for tight muons
• ID for loose muon and electron
• Analysis cuts
• Sensitivity for 500 pb-1
• Timeline

2
ID Cuts for tight central muons
3
ID Cuts for loose muon and loose electron
Peters suggestions
4
Isolation of the third objectin the SUSY MC
Tighten iso cut on the track to increase
acceptance in place of third obje or ? ?

• Track accepted if not resonance with the 2
  selected muons
• 3rd Electron accepted if no electron resonances
  in the event
• 3rd Muon accepted if not resonance with the 2
  selected muons and no other resonances in the
  event

5
Analysis cuts new approach

• Ask for the third object as frist step and
  optimize the cuts on the trilepton selected
  events
• One high pt and one loose pt muon (Di? event)
• Third object one loose muon OR one loose
  electron
• Jet requirement
• Invariant mass requirement
• Significance requirement
• Met requirement
• Check third object as track

6
Third object
S2.84 B230 S/vB0.19
S1.34 B16 S/vB0.33
7
Jet content (I)
Uncorrected Corrected at L4 Corrected at L5

• Jet Energy is corrected at L5
• (absolute)
• Accept event if
• nJet0 or Leading Jet Et lt 30 GeV (a)
• nJet(Etgt20GeV) lt2 nJet(Etgt80GeV)0 (b)

Susy
Susy t-tbar
8
Jet Content (II)
S1.16 B14.51 S/vB0.30
S1.31 B15.16 S/vB0.34
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Invariant mass

• Remove resonances to be point independent
• Reject events if OS M?? in 2.93.2 - 9.111
  - 76,106 GeV

S1.28 B7.2 S/vB0.48
10
Missing energy

• Missing Energy is corrected for muons and jets
• Good agreement between Met at generator level and
  corrected Met in all samples BUT Z??

11
Significance (I)

• Better discrimation between DY and signal
• Less energy scale dependence

Met and Sumet corrected for muons and jets
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Significance (II)
Susy
Z??
S1.0 B 0.068 S/vB3.83
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Missing Energy

• Cut needed just to define the control region ---
  not useful for S/vB maximization ?
• Final cut on Met

S1.0 B 0.0047 S/vB 4.6
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Summary of proposed cuts
S1.0 B 0.069 S/vB 3.81
D0 point S2.0 B 0.069 S/vB 7.62
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Summary of D0 cuts
Mass in 1560 GeV Met gt 15 GeV ??lt160 no
jets wit Etgt 50 GeV
S0.97 B0.33 S/vB1.69
D0 point S1.61 B 0.33 S/vB 2.8
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Timeline

• Cross check with Liverpool --- done
• Selection of third object --- done
• Selection ok kinematic cuts --- done
• Goal is to have the sensitivity study for Dec 2nd
  
• To do,
• Include fake rate up to Nov. 20th --- Martin
  released code
• Low Met control region up to Nov. 27th

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Met in tt sample