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W( → eν)+jets

W( → eν)+jets. Kira Grogg UW-Madison 21/07/09 June, 2009. Action Items. Maximum likelihood fit to W transverse mass Still learning how to do fits with Minuit Comparison of my events numbers to those in W inclusive and W/Z+jets ratio note See table on following slide

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W( → eν)+jets

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  1. W(→eν)+jets Kira Grogg UW-Madison 21/07/09 June, 2009 K. Grogg, UW-Madison

  2. Action Items • Maximum likelihood fit to W transverse mass • Still learning how to do fits with Minuit • Comparison of my events numbers to those in W inclusive and W/Z+jets ratio note • See table on following slide • Signal and all backgrounds included • Optimize PF jet cut • Will look at different jet algorithms • SIScone in new ntuples K. Grogg, UW-Madison

  3. W Event number comparisons All numbers are for 100 pb-1 * W inclusive uses electron pT > 30 GeV * W/Z+jets ratio uses electron pT > 20 GeV OK OK W inclusive makes isolation cuts before ID cuts W/Z+jets ratio makes ID cuts before isolation cuts W/Z+jets ratio uses slightly different electron ID (see backup) K. Grogg, UW-Madison

  4. QCD Event number comparisons All numbers are for 100 pb-1 * W inclusive uses electron pT > 30 GeV * W/Z+jets ratio uses electron pT > 20 GeV OK Not OK W inclusive makes isolation cuts before ID cuts W/Z+jets ratio makes ID cuts before isolation cuts W/Z+jets ratio uses slightly different electron ID (see backup) W inclusive showing QCD_EmEnriched (BCtoE adds an additional 441 events) W/Z+jets ratio uses BCtoE only My cuts use QCD_EmEnriched only K. Grogg, UW-Madison

  5. Other V+jets Event number comparisons All numbers are for 100 pb-1 * W inclusive uses electron pT > 30 GeV * W/Z+jets ratio uses electron pT > 20 GeV OK OK W inclusive makes isolation cuts before ID cuts W/Z+jets ratio makes ID cuts before isolation cuts W/Z+jets ratio uses slightly different electron ID (see backup) W/Z+jets ratio does not include W→ττ, my cuts do include W→ττ K. Grogg, UW-Madison

  6. Ttbar Event number comparisons All numbers are for 100 pb-1 * W inclusive uses electron pT > 30 GeV * W/Z+jets ratio uses electron pT > 20 GeV OK OK W inclusive makes isolation cuts before ID cuts W/Z+jets ratio makes ID cuts before isolation cuts W/Z+jets ratio uses slightly different electron ID (see backup) K. Grogg, UW-Madison

  7. W transverse mass (1 jet events) No HLT applied Applied single electron 15 HLT Same plots for 1,2,3,4 jets in backup slide K. Grogg, UW-Madison

  8. Conclusions/Next steps • My event numbers are mostly consistent with the W inclusive group • I have slightly more (1.22x) events • Including the HLT could help • The W/Z+jets ratio numbers were not consistent • I have 3.3x as many events • Possibly because I use QCD_EmEnriched instead of BCtoE • They claim that the QCD_EmEnriched was negligible after cuts • Currently working on: • Background estimation and subtraction methods • ABCD method • Fitting W transverse mass K. Grogg, UW-Madison

  9. Backup K. Grogg, UW-Madison

  10. W transverse mass for 1 – 4 jets No HLT applied Applied single electron 15 HLT K. Grogg, UW-Madison

  11. W/Z + jets ratio ID cuts • H/E • ∆ϕin • ∆ηin • Eseed/pout • ∑9/∑25 • σηη K. Grogg, UW-Madison

  12. Signal + Background Samples • W+jets • Cross section 40 nb-1 • /Wjets/Summer08_IDEAL_V11_redigi_v1/GEN-SIM-RECO • QCD • Cross section X-Y - 20-30: 0.40 mb-1, 30-80: 0.10 mb-1, 80-170: 1.9*103 mb-1 • /QCD_Emenriched_PtXtoY/Summer08 _IDEAL_V11_redigi_v2/GEN-SIM-RECO • Z+jets • Cross section 3.7 nb-1 • /ZJets/Summer08_IDEAL_V11_redigi_v1/GEN-SIM-RECO • Ttbar+jets • Cross section 317 pb-1 • /TtJets/Summer08_IDEAL_V11_redigi_v1/GEN-SIM-RECO • Using PAT and Particle Flow with CMSSW_2_2_9 K. Grogg, UW-Madison

  13. ID variables vs Absolute Isolation • Possible variables for ABCD method • Id variables vs relative isolation for W and QCD events σiηiη Δφin SumIsos SumIsos Δηin SumIsos K. Grogg - UW-Madison

  14. W mT and MET vs electron isolation Possible variables for ABCD Method (NB * NC)/ND = 41619 (NB * NC)/ND = 29228 NA = 44991 NB = 1.4x106 NC = 5.6x105 ND = 1.9x107 NA = 26678 NB = 1.4x106 NC = 3.9x105 ND = 1.9x107 K. Grogg, UW-Madison

  15. W mT vs combined relative isolation W events QCD events K. Grogg, UW-Madison

  16. MET vs combined relative isolation W events QCD events K. Grogg, UW-Madison

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