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

• List of unprescaled triggers in 2012: LowestUnprescaled2012

• List of unprescaled triggers in 201: LowestUnprescaled2011

• B-jet trigger in mc12 and data12: B-jet trigger

• Egamma trigger: Efficiency measurements summary page

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)