Search for chargino and neutralino into channel

1
Search for chargino and neutralino into ?? channel

• People involved
• D.Bortoletto, A.C, O.Gonzalez, E.Lytken

• Outline of the talk
• Signal topology
• Tools developed
• Trigger efficiency results
• S/v(SB) optimization for the high pT regime
• Comparison between the high and low pT regime
• First look at control regions
• Timeline

2
Event topology

• Signal point from CDFNote 6968
• 2 possible choices high and low pt (explain .
  )
• For high pt the ID and the trigger eff are
  understood (corresponds to sample..)
• For the low pt the ID and the trigger eff have to
  be studied (corresponds to sample)

PLOTS sugrascan plot
3
Developing the toolsfor low pT regime

• ID Eff (see Elses talk at JP and CDF note 7197)
  Just a list of currents ID
• Trigger efficiency (CDF note 7196)
• Trigger of interest
• Method
• Bias removal
• Muon selection
• Trigger efficiency measurement

PLOTS pt distributions before and after bias
removal
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Efficiency of L1 triggers

• Stub and track efficiency for L1 cmu1.5 and cmup6
  (quote n. only)
• L1 efficiency for cmu1.5 and cmup6
• comparison with high pt or B group for
  consistency
• Turn on at 4 Gev - 50 efficiency
• Plateau at 5 GeV as low as 5 GeV to gain in
  acceptance

PLOTS L1 eff vs pt for both triggers vs eta
Asymm in eta same as high pt time dependance
? Do we show eff vs isolation?
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Efficiency of Single Muon path

• Path cmu4 for both L1 cmu1.5 and L1 cmup6
• Comparison with high pt for consistency
• Value suitable to dilepton trigger efficiency
  (both dimuon triggers and mixed triggers CEM4)

PLOTS efficiency vs pt for cmu4/cmu1.5 and for
cmu4/cmup6
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Summary of trigger efficiencies
Tools ready for mu-mu (and e-mu) channel at low
pt?
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Dimuon seach strategy

• Focuse on high pT scenario
• Require one high pT muon and one low pT muon
  (20,4 GeV)
• Remove J/?, ? and Z
• MET gt 15 GeV
• Require third muon

As for now, third muon is a tight muon Loose muon
ID defined after fake rate optmization Extension
to electron performed next
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Geometrical distribution of muons

• DeltaPhi between muons
• DeltaR between muons
• Isolation vs pt

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Missing energy content

• DeltaPhi between met and muon (max and min)
• DeltaPhi between met and muon (leading - non
  leading)
• Met vs pt of leading non leading muon

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In case we do not veto jets

• DeltaPhi between jet and met

? Do we need it
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Standard model backgrounds for the mm channel

• Backgrounds which are included in the estimation
  of
• S/v(SB)
• Diboson (WW,WZ,WW)
• Heavy flavour (t-tbar, b-bbar, c-cbar)
• Drell Yan
• Z decaying into mumu, into tautau
• W decaying into mu
• Wjets (W into muBB, muCC, mu1p)

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S/v(SB)

• InvMass (J/?, ? and Z )
• Met gt 15 GeV
• DeltaPhi between muons gt 140

PLOTS signal over background for the 3 variables
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Comparison between high and low pT
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First look at control regions

• Should identify several control regions according
  to the dominant background
• Low met (metlt 15 GeV)
• Veto leptons
• DeltaR between muons lt 0.4 rad
• DeltaPhi between muons lt 140
• Min DeltaPhi between met and muon gt 140

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Control region (I)
PLOTS invariant mass, DeltaR, both deltaPhi

• Low met
• Dominant background ?
• Veto leptons
• Dominant background ?

PLOTS met
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Control region (II)

• Geometrical requirements
• Dominant background ?

PLOTS invariant mass and met for the 3 control
regions
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Timeline

• We aim to have results for the winter conferences
• TO DO
• Cuts optimization
• ID for loose muon
• Fake rate
• Control region data-mc