Septemper 2007

• Goal
• Getting Started SusyAnalzer
• PTDR
• Measurement of reconstruction efficiency and purity
  • Measurement of electron reconstruction efficiency and purity
  • Measurement of muon reconstruction efficiency and purity
    • DrellYan_mumu_40
    • RelVal152Z-MM
    • SingleMuMinus_pt5to200
      • Momentum deviation distribution
• Measurement of reconstruction fake rate

Goal ( Training )

• Adapting myself to SusyAnalyzer quickly
• Studying PTDR inclusive muons and Supersymmetry
• Verifying the performance of SusyAnalzer
  • Measuring reconstruction efficiency and purity of both muon and electron
  • Measuring momentum deviation
  • Measuring reconstruction fake rate

Getting Started SusyAnalyzer

• SusyAnalyzer
• An example inclusive H->ZZ->4leptons?

PTDR

• http://cmsdoc.cern.ch/cms/cpt/tdr/

Measurement of reconstruction efficiency and purity

• Goal
  • Studying how to measure efficiency and purity, and improve precision of measurement
  • Verifying the MatchObject algorithm in SusyAnalyer

Fixing CMSSW 1_5_2 except SingleMuMinus5to200

Electron

• Data set : RelVal152Z-EE
• Event number : 2150
• Cuts
  • |η| < 2.4
  • Pt >= 10 GeV
• Expecting lower efficiency ~ 50% than muon's

• Pt and eta efficiency
  • 
• Pt and eta purity
  • 

• Low precision in high Pt ( > 50 ) region
• Poor purity

Muon

• Data sets
  • DrellYan_mumu_40
  • RelVal152Z_MM
  • SingleMuMinus_pt5to200
    • Compatible with CMSSW_1_3_x, incompatible with CMSSW_1_5_x
• Expecting higher efficiency ~ 95% than electron's
• Expecting good purity ~ 100%

DrellYan_mumu_40

• Event number : 24000
• Cuts
  • |η| < 2.4
  • Pt >= 10 GeV
• Pt and eta efficiency
  • 
• Pt and eta purity
  • 

RelVal152Z_MM

• Event number : 5100
• Pt and eta efficiency
  • 
• Pt and eta purity
  • 
• As well as electron's, low precision in high Pt region
• Two small peaks in efficiency vs pseudorapidity plot

SingleMuMinus_pt5to200

• Event number : 208000
• CMSSW_1_3_3, CRAB_1_5_3
• Using CRAB
• Pt and eta efficiency
  • 
• Pt and eta purity
  • 

• Momentum deviation distribution
• Deviation distribution vs Pt
  • 
• Deviation distribution vs eta
  • 

Measurement of reconstruction fake rate

• Goal
  • Measuring and comfirming reconstruction fake rate
  • Verifying Isolation algorithm in SusyAnalyzer
• Using QCD event sample : QCD_pt_30_50
• Electron
  • Total MC truth including Iso and No Iso objects
    • 
  • Pt > 10 GeV : Removing soft electrons
    • 
  • |η| < 2.4
    • 
  • Total RECO objects including Iso and No Iso objects
    • 
  • Pt > 10 GeV and |η| < 2.4
    • 
  • Matching RECO objects
    • 
• Conclusion
  • The ratio RECO Match Objects / MC Truth = 15 / 24 ~ 62.5% in case of Isolation
  • Therefore ~ 35% RECO electrons are fake
• Muon
  • Total MC truth including Iso and No Iso objects
    • 
  • Pt > 10 GeV : Removing soft muons
    • 
  • |η| < 2.4
    • 
  • Total RECO objects including Iso and No Iso objects
    • 
  • Pt > 10 GeV and |η| < 2.4
    • 
  • Matching RECO objects
    • 
• Conclusion
  • The ratio RECO Match Objects / MC Truth = 10 / 12 ~ 83% in both case of Isolation and Non-isolation
  • The fake rate of muon reconstruction is quite low

-- SangUnAhn - 26 Oct 2007