FakeBackgroundEstimate

This page summarizes studies related to Fake Background Estimate.

Fake Factor

Trigger and Object Definition

Electron Trigger

pT range HCP2012 Moriond2013
pT < 20 GeV g20_etcut & e11_etcut e5_etcut & e5_medium1
pT > 20 GeV g24_etcut g24_etcut

  • e5_etcut is for Denominator only, while e5_medium1 is for Numerator.

Muon Trigger

  • always use only "mu15" with away-side jet requirement

Electron

ID Electron Fake Electron
Apply electron energy smearing same
Author 1 or 3 (egamma) same
Pt(cluster) > 15 GeV same
abs(η(cluster)) < 2.47 and exclude crack region 1.37 < abs(η(cluster)) < 1.52 same
OTX cleaning cut same
Tight++ ! Medium++
fabs(z0sin w.r.t. PV) < 0.4 mm same
Impact parameter significance (d0sig) < 3 same
TopoEtcone30Corr/Et < 0.16 TopoEtcone30Corr / Et < 0.30
ptcone30/Et < 0.12 (Et > 25 GeV : 0.16) ptcone30 / Et < 0.16

Muon

ID Muon Fake Muon
Apply muon pT smearing same
Staco combined muon same
mu_staco_pt > 15 GeV same
fabs(mu_staco_eta) < 2.5 same
MCP ID selection same
abs(z0 w.r.t. PV) < 1 mm same
Impact parameter significance (d0 sig) < 3 no cut
Etcone30Corr/pt < 0.20 && Etcone30Corr/pt < ((0.014*pTCB_smeared)-0.15) Etcone30Corr/pt < 0.30
ptcone30/pt < 0.1 && ((0.01*pTCB_smeared)-0.105) no cut

Overlap Removal (ID lepton)

mu/e Delta R(e-mu) < 0.1 --> Keep muon, remove electron
e/e Delta R(e-e) < 0.1 --> Keep higher pt electron
e/jet Delta R(e-jet) < 0.3 ---> Keep electron, remove jet
mu/jet Delta R(e-jet) < 0.3 ---> Keep jet, remove muon

Overlap Removal (Fake lepton)

mu/e Delta R(e-mu) < 0.1 --> Keep muon, remove electron
e/e Delta R(e-e) < 0.1 --> Keep higher pt electron
e/jet Delta R(e-jet) < 0.3 ---> Keep electron, remove jet
mu/jet Delta R(e-jet) < 0.3 ---> Keep muon, remove jet

Plots

Systematics on Fake Factor

EW contamination

Pile-Up Dependence

Sample Dependence (MC closure)

W+jets CR

Same Sign Validation

New recommendations for photon identification and calibration have been released by the E/gamma combined performance group. For all the details please refer to the message sent by the E/gamma conveners ( here ). The main points to consider are the following :

  • Photon Identification :
    • For 2011 analyses : as described here.
    • For 2012 analyses : for the cut based selection have been made available : see here.

  • Code : use egammaAnalysisUtils-00-04-19 from here

Contact - Keisuke Yoshihara (Keisuke.Yoshihara@cernNOSPAMPLEASE.ch)

Topic attachments
I Attachment History Action Size Date Who Comment
Unknown file formateps electron_ff_Final.eps r1 manage 14.3 K 2013-02-02 - 03:08 UnknownUser  
Unknown file formateps muon_ff_Final.eps r1 manage 14.4 K 2013-02-02 - 03:08 UnknownUser  
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Topic revision: r1 - 2013-02-02 - unknown
 
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