CSA08 Electron: Tag & Probe Updates

1. CSA08 Electron: Tag & Probe Updates Jeffrey Berryhill Kalanand Mishra Fermilab Update on tag-probe efficiency with CSA08 data

2. A quick overview on Tag & Probe selection Tag Selection Probe Selection • Input: GsfElectrons. • In ECAL: || < 2.5 & pT < 20 GeV/c. • Track isolation. • Electron ID: Loose selection • Input: SuperClusters. • In ECAL: || < 2.5 & pT < 15 GeV/c. • Fit the tag-probe invariant mass to get the number of signal events. Obtain factorized efficiencies for passing probes: SuperCluster  GsfElectron  Isolation  HLT Kalanand Mishra, Fermilab

3. Progress this week • Last week we reproduced Nikos’ results, and in the process found some technical problems: - inclusion of HLT information: now solved - need to produce factorized efficiency, not cumulative : now done (see next two slides) • After Nikos’ bug fix in his electron “duplicate-removal” code, our efficiency numbers match pretty well. • Some additional features to our tag-and-probe package: now efficiency can be calculated in two dimensional bins of kinematic variables, e.g., “, ” or “pT, ” or “px , py” etc. Kalanand Mishra, Fermilab

4. Efficiency: Probe SC  GsfElectron SuperCluster  GsfElectron  Isolation  HLT  pT These numbers match with those from Nikos’ pretty well. Kalanand Mishra, Fermilab

5. Efficiency:GsfElectron Isolation  HLt SuperCluster GsfElectron Isolation  HLT  pT Seems like a pathological fit, need to look into the MINUIT fit results SC GsfElectron  Isolation  HLT Kalanand Mishra, Fermilab

6. Status & Summary • Previous week’s technical problems solved, some additional features added to the package. • Ready to take up David’s challenge. • Tag-and-probe package available via MuonAnalysis/TagAndProbeHead • Discussed the code organization in a previous presentation in this forum. Thank You ! Kalanand Mishra, Fermilab