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W( → eν)+jets electron selection

W( → eν)+jets electron selection. Kira Grogg UW-Madison 17/06/09 June, 2009. Action Items. Make PFJet cuts of 30, 45 and 60 GeV in addition to 15 GeV In following slides; not pretty Make p T of W plots background subtracted use projected fit for background

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W( → eν)+jets electron selection

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  1. W(→eν)+jetselectron selection Kira Grogg UW-Madison 17/06/09 June, 2009 K. Grogg, UW-Madison

  2. Action Items • Make PFJet cuts of 30, 45 and 60 GeV in addition to 15 GeV • In following slides; not pretty • Make pT of W plots background subtracted use projected fit for background • Currently researching how to do this • Look at more variable cuts to reduce background • One possible cut: |d0| < 2 mm • For prompt electrons, use |d0| < 0.2 mm • Needs to be added to ntuple • Looking at conversion rejection algorithms as suggested by V+jets group K. Grogg, UW-Madison

  3. MET for 1, 2, 3, 4+ jet (pT > 15 GeV) events Backgrounds are stacked Red line is stack of S+B MET, 1 reco jet MET, 2 reco jets Selection applied: Electron |η| < 2.4 Electron pT > 20 GeV V11 tuned ID cuts RelCombIso < 0.1 MET, 3 reco jets MET, 4 reco jets K. Grogg, UW-Madison

  4. MET for 1, 2, 3, 4+ jet (pT > 30 GeV) events Backgrounds are stacked Red line is stack of S+B MET, 1 reco jet MET, 2 reco jets Selection applied: Electron |η| < 2.4 Electron pT > 20 GeV V11 tuned ID cuts RelCombIso < 0.1 MET, 3 reco jets MET, 4 reco jets K. Grogg, UW-Madison

  5. W mT for 1, 2, 3, 4+ jet (pT > 15 GeV) events Backgrounds are stacked Red line is stack of S+B W mT, 1 reco jet W mT, 2 reco jets Selection applied: Electron |η| < 2.4 Electron pT > 20 GeV V11 tuned ID cuts RelCombIso < 0.1 W mT, 3 reco jets W mT, 4 reco jets K. Grogg, UW-Madison

  6. W mT for 1, 2, 3, 4+ jet (pT > 30 GeV) events Backgrounds are stacked Red line is stack of S+B W mT, 1 reco jet W mT, 2 reco jets Selection applied: Electron |η| < 2.4 Electron pT > 20 GeV V11 tuned ID cuts RelCombIso < 0.1 W mT, 3 reco jets W mT, 4 reco jets K. Grogg, UW-Madison

  7. W pT for 1, 2, 3, 4+ jet (pT > 15 GeV) events Backgrounds are stacked Red line is stack of S+B W pT, 1 reco jet W pT, 2 reco jets Selection applied: Electron |η| < 2.4 Electron pT > 20 GeV V11 tuned ID cuts RelCombIso < 0.1 55 < mT < 105 W pT, 3 reco jets W pT, 4 reco jets K. Grogg, UW-Madison

  8. W pT for 1, 2, 3, 4+ jet (pT > 30 GeV) events Backgrounds are stacked Red line is stack of S+B W pT, 1 reco jet W pT, 2 reco jets Selection applied: Electron |η| < 2.4 Electron pT > 20 GeV V11 tuned ID cuts RelCombIso < 0.1 55 < mT < 105 W pT, 3 reco jets W pT, 4 reco jets K. Grogg, UW-Madison

  9. # events by # of jets for different jet pT After full selection….remaining W events From W/Z + jets ratio note Calo jet > 30 GeV Track jet > 15 GeV After full selection….remaining QCD events K. Grogg, UW-Madison

  10. Number of generated vs reconstructed jets # PF jets # PF jets Jet pT > 15 Jet pT > 30 Gen jets might need different pT cut than PF jet W events only # Gen jets # Gen jets # PF jets # PF jets # partons (Madgraph proc ID) # partons (Madgraph proc ID) K. Grogg, UW-Madison

  11. Conclusions/Next steps • PF jet pT cut of 15 GeV is reasonable • Top background still needs more investigation • Invariant mass of jets • In progress • HT? Shape? B-tagging? • W transverse mass fit to project signal W pT • Need to understand background estimation and subtraction methods • ABCD method • Template method • Meeting with Pedrame on Friday to discuss data-driven QCD methods K. Grogg, UW-Madison

  12. Backup K. Grogg, UW-Madison

  13. Number of generated vs reconstructed jets • QCD events only • Gen jets might need different pT cut than PF jet # PF jets Jet pT > 15 Jet pT > 30 # Gen jets K. Grogg, UW-Madison

  14. Electron pT for 1, 2, 3, 4+ jets Selection applied: Electron |η| < 2.4 Electron pT > 20 GeV V9 tuned ID cuts RelCombIso < 0.1 Electron pT, 1 reco jet Electron pT, 2 reco jets Electron pT, 3 reco jets Electron pT, 4 reco jets K. Grogg, UW-Madison

  15. Electron η for 1, 2, 3, 4+ jets Selection applied: Electron |η| < 2.4 Electron pT > 20 GeV V9 tuned ID cuts RelCombIso < 0.1 Electron η, 1 reco jet Electron η, 2 reco jets Electron η, 3 reco jets Electron η, 4 reco jets K. Grogg, UW-Madison

  16. Leading Jet η for 1, 2, 3, 4 jets Selection applied: Electron |η| < 2.4 Electron pT > 20 GeV V9 tuned ID cuts RelCombIso < 0.1 55 < mT < 105 Leading jet η, 1 reco jet Leading jet η, 2 reco jets Leading jet η, 3 reco jets Leading jet η, 4 reco jets K. Grogg, UW-Madison

  17. W rapidity for 1, 2, 3, 4 jets Selection applied: Electron |η| < 2.4 Electron pT > 20 GeV V9 tuned ID cuts RelCombIso < 0.1 55 < mT < 105 W rapidity, 1 reco jet W rapidity, 2 reco jets W rapidity, 3 reco jets W rapidity, 4 reco jets K. Grogg, UW-Madison

  18. Iso Efficiency by number of jets, Barrel vs Endcap S/√(S+B) S/√(S+B) Barrel Endcap # PF jets in event # PF jets in event Efficiency Efficiency RelCombIso RelCombIso # PF jets in event # PF jets in event K. Grogg, UW-Madison

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