Status of e

1
Status of eµ low-pT trilepton analysis

• M.Rossi,G.Pauletta,M.Giordani
• Udine University

2
Since last time

• Fixed bug in Larry Correction for muon pT
• Following now Join Physics prescription
• Larry Correction not applied at MC
• eµ and µe channels separately
• First look at fakes in the dilepton CRs

3
Leptonfake Calculation

• Using CEM8 and CMUP8 inclusive samples
• Leptonfake 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
• (eCEM4/e CEM8) but
• Dont have the numbers handy
• Neglecting it as a first estimate should be fine
• eCEM4 0.956, eCEM18 0.966
• eCMUP4 0.92, eCMUP18 0.90
• Rescale for the considered integrated luminosity

4
eµ (20,8) selection
Meµ
MET
OS
SS
5
µe (20,8) selection
Mµe
MET
OS
SS
6
eµ (10,5) selection
Meµ
MET
OS
SS
7
µe (10,5) selection
Mµe
MET
OS
SS
8
Conclusions

• Still a lot to understand ?
• eµ (10,5) still problematic,
  fakes did not solve the discrepancy
• Any suggestion is more than welcome ?

9
Data and MC

• Data
• SUSY dilepton dataset edil0d
• Good run list v7 no silicon
• 224pb-1 up to February 2004
• Dielectron events
• DIELECTRON_CENTRAL_4 trigger
• Dimuon events
• DIMUON_CMUPCMUP4 trigger
• Electron-Muon events
• CEM4_CMUP4 trigger

10
Data and MC

• MC
• Signal point 360fb-1 (m0100,m1/2180,A00,tanß5
  ,µgt0)
• DY sexo9t (Z ?ll, Mllgt5GeV/c2) 5fb-1
• ttbar (ttopel) 170fb-1
• WW (wtop1w) 34fb-1
• ZZ (multilepton) 535fb-1
• WZgamma (MadGraph) 300-2500fb-1
• bbbar (Giovanni) 30pb-1

11
Lepton Selection

• High pT (gt20GeV/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
• CEM ID Scale Factors
• CMUP ID Scale Factors

SF ET CDF note 1.00
4-8GeV 7379 1.03 8-20GeV 7233
0.996 gt20GeV 7309
SF PT CDF note
0.85 4-20GeV 7197 0.881
gt20GeV 7309
12
eµ Control Regions

• METgt15 GeV and nJETlt2 (AE)
• METgt15 GeV and nJETgt1 (A2F)
• METlt10 GeV and nJETlt2 (GI)
• METlt10 GeV and nJETgt1 (HJ)

1st lepton pTgt20 GeV/c 2nd lepton pTgt8 Gev/c