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W->eν + jets plots for internal note

W->eν + jets plots for internal note. Kira Grogg University of Wisconsin -Madison. W+jets sample & selection. Using W->enu skimmed CSA07 samples (chowder) PAT (defaults) with CMSSW_1_6_12 Reproducing W plots previously seen in CMS AN 2006/102 Partially applying PAS selection.

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W->eν + jets plots for internal note

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  1. W->eν + jetsplots for internal note Kira Grogg University of Wisconsin -Madison

  2. W+jets sample & selection • Using W->enu skimmed CSA07 samples (chowder) • PAT (defaults) with CMSSW_1_6_12 • Reproducing W plots previously seen in CMS AN 2006/102 • Partially applying PAS selection

  3. Electron PT Signal & Background 1 jet events 2 jet events Cuts: Robust ID Track isolation 3 jet events 4 jet events 20 GeV cut on electron pT

  4. W MT Signal vs Background 1 jet events 2 jet events Cuts: Robust ID Track isolation Electron pT > 20 Cuts: Robust ID Track isolation 3 jet events 4 jet events 20 GeV cut on electron pT

  5. MET Signal vs Background 1 jet events 2 jet events Cuts: Robust ID Track isolation Electron pT > 20 55 < W MT < 105 3 jet events 4 jet events 20 GeV cut on electron pT

  6. Leading Jet PT 1 jet events 2 jet events Cuts: Robust ID Track isolation Electron pT > 20 55 < W MT < 105 Cuts: Robust ID Track isolation 3 jet events 4 jet events 20 GeV cut on electron pT

  7. W PT Signal vs Backgrounds 1 jet events 2 jet events Cuts: Robust ID Track isolation Electron pT > 20 55 < W MT < 105 Cuts: Robust ID Track isolation 3 jet events 4 jet events 20 GeV cut on electron pT

  8. Jet PT Spectrum Sample: >=1 corrected reco jets (pt > 60 GeV) Uncorrected Jet PT Corrected Jet PT Cuts: Robust ID Track isolation Electron Pt > 20 55 < W MT < 105

  9. Overview of Selection of W events • 1st electron pT > 20 GeV, 2nd electron pT < 20 GeV • |η| < 2.5, with 1.4442 < |η| < 1.560 excluded • Robust electron ID (see PAS) • Track Isolation • no tracks (min pt=1.5) within an annulus of 0.02-0.2 are found to have pt/sumpt above 3 • W MT cut of ±25 GeV around the W mass • pat::Jets, are built from iterativeCone5CaloJets • Corrected jet pT > 60 GeV, no η requirement • No overlap (dR = 0.3) with electron from W

  10. Signal and Background / Cut Sample: >=1 corrected reco jets (pt > 60 GeV)

  11. Conclusions/Future Plans • Using uncorrected MET so far • Maybe have better correction in 2_1_X (particle flow?) • Have now included Z->ee, ttbar, and QCD backgrounds • QCD background is too ‘spikey’ at the moment • Ttbar background dominates at >=3 jets • These plots will go into the internal note for the 1_6_12 results • Move on to CMSSW_2_1_X

  12. Backups

  13. W MT by MET Cut

  14. MET Gen & Reco Sample: >=1 corrected reco jets (pt > 50 GeV) Over correction

  15. W PT Gen & Reco, >=0 jets W pT using corrected & uncorrected MET Bad correction

  16. W (Gen PT – Reco PT)/Gen PT, >= 0 jets Using uncorrected MET Using corrected MET Bad correction

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