Status of e μ low-p T trilepton analysis
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Transcript of Status of e μ low-p T trilepton analysis
February 21, 2006 SUSY meeting 1
Status of eμ low-pT trilepton analysis
M.Rossi,G.Pauletta,M.Giordani
Udine University
February 21, 2006 SUSY meeting 2
Data and MC Data
□ SUSY dilepton dataset edil0d ■ Good run list v7 no silicon (224pb-1), CEM4_CMUP4 trigger
MC□ Signal point (m0=100,m1/2=180,A0=0,tanβ=5,μ>0) ~360fb-1
□ DY sexo9t (Z ll, Mll>5GeV/c2) ~5fb-1
□ ttbar (ttopel) ~170fb-1
□ WW (wtop1w) ~34fb-1
□ ZZ (Oscar) ~535fb-1
□ WZ (Madgraph) ~430fb-1
□ bbbar (Giovanni) ~57pb-1
Fakes □ using CEM8 and CMUP8 inclusive samples□ Lepton+fake selection requiring events with
■ real first lepton (CEM8 for eμ and CMUP8 for μe)■ fake lepton using Liverpool method
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Event Selection
Events with 1 electron and 1 muon □ Leading lepton pT>10 GeV/c
□ Next-to-leading lepton pT>5 GeV/c
High pT (>20GeV/c) CEM and CMUP selection□ Standard top/ewk definition
4-20GeV/c pT range □ Muon ID as in CDF 7197 (Purdue)
□ Electron ID as high pT
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Last time Meμ
OS
SS
MET
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Since last time
Code□ Fixed bug in dilepton fake estimation□ Fixed bug in bbbar sample
MC□ WZ NEW inclusive sample ~430fb-1
□ bbbar (Giovanni) ~57pb-1 (last time 30 pb-1)
February 21, 2006 SUSY meeting 6
eμ Control Regions
□ A+E• MET>15 GeV • nJET<2
□ A2+F• MET>15 GeV • nJET>1
□ G+I• MET<10 GeV • nJET<2
□ H+J• MET<10 GeV • nJET>1
If TRILEPTON, SIGNAL REGION
Invariant Mass of Mll
MET
15 76 106
10
15
nJets <2
nJets >1
G
H
I
J
A
A2
E
F
A
A2
G
H
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eμ events
OS
Meμ MET
SS
February 21, 2006 SUSY meeting 8
eμ Control Regions
Meμ
OS
□ A+E• MET>15 GeV • nJET<2
□ A2+F• MET>15 GeV • nJET>1
□ G+I• MET<10 GeV • nJET<2
Meμ Meμ
February 21, 2006 SUSY meeting 9
eμ Control Regions
A+E A2+F G+I H+J
Signal 0.813 ± 0.001 0.0155±0.0001 0.051±0.0001 0.001±0.00002
Data 37 5 180 0
MCtot 28.9±0.2 3.61±0.05 112.6±28.8 0.27±0.01
DY 20.7±0.2 0.87±0.05 27.46±0.27 0.08±0.01
WW 3.79±0.01 0.152±0.003 0.22±0.003 0±0
WZ/γ* 0.669±0.001 0.0107±0.0001 0.023±0.0001 0.001±0.00002
ttbar 0.651±0.001 2.274±0.002 0.008±0.0001 0.053±0.0003
bbar 0±0 0±0 54.01±28.75 0±0
ZZ 0.1569±0.0001 0.007±0.00004 0.076±0.0001 0.002±0.00002
fakes 2.9 0.3 30.8 0.16
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μe events
OS
Mμe MET
SS
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μe Control Regions
OS
□ A+E• MET>15 GeV • nJET<2
□ A2+F• MET>15 GeV • nJET>1
□ G+I• MET<10 GeV • nJET<2
Mμe Mμe Mμe
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μe Control Regions
A+E A2+F G+I H+J
Signal 0.812 ± 0.001 0.0145±0.0001 0.051±0.0001 0.0004±0.00003
Data 36 5 142 0
MCtot 29.87±6.18 3.27±0.05 84.19±29.5 0.097±0.01
DY 22.8±0.2 0.82±0.05 27.00±0.27 0.04±0.01
WW 3.82±0.01 0.162±0.003 0.22±0.003 0±0
WZ/γ* 0.65±0.0004 0.008±0.00005 0.023±0.0001 0.001±0.00002
ttbar 0.65±0.001 2.28±0.002 0.008±0.0001 0.054±0.0003
bbar 2.49±6.17 0±0 56.87±29.5 0±0
ZZ 0.166±0.0002 0.007±0.00004 0.065±0.0001 0.002±0.00002
fakes 0 0 0 0
February 21, 2006 SUSY meeting 13
Conclusions
Much more confident in lepton+fake estimation
bbbar □ need a lot more□ will double the statistics by next week
Dilepton CRs need some more work but look much more reasonable than last time
Will look at trilepton CR and 320 pb-1
February 21, 2006 SUSY meeting 14
Lepton+fake Calculation
Using CEM8 and CMUP8 inclusive samples Lepton+fake selection requiring events with
□ real first lepton■ CEM8 for eμ and CMUP8 for μe
□ fake lepton using Liverpool method Should rescale for the trigger efficiency (εCEM4/ε CEM8) but
□ Don’t have the numbers handy□ Neglecting it as a first estimate should be fine
■ εCEM4 = 0.956, εCEM18 = 0.966■ εCMUP4 = 0.92, εCMUP18 = 0.90
Rescale for the considered integrated luminosity
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μe (10,5) OLD
OS
SS
Mμe MET