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Dileptons, MET and Jets Production

Dileptons, MET and Jets Production. M. Weinberg. Progress on action items. Data driven methods of QCD, tt background estimation Look at QCD, tt background reduction Isolation Show separate track, ECAL and HCAL isolation Plots made; will show combined / ECAL isolation plots

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Dileptons, MET and Jets Production

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  1. Dileptons, MET and Jets Production M. Weinberg Weekly UW CMS Meeting - Physics & Trigger

  2. Progress on action items • Data driven methods of QCD, tt background estimation • Look at QCD, tt background reduction • Isolation • Show separate track, ECAL and HCAL isolation • Plots made; will show combined / ECAL isolation plots • For 2D plots use box option • Tried color option instead to see features • Separated leptons into small-pT bins to help study low-pT isolation • Made plots of isolation cut efficiency vs. pT Weekly UW CMS Meeting - Physics & Trigger

  3. Combined isolation distributions • Combined isolation for very low- / low-pT electrons • Very low pT: 5 – 10 GeV; low pT: 25 – 30 GeV • Prompt electrons from LM1; non-prompt / fake electrons from QCD Weekly UW CMS Meeting - Physics & Trigger

  4. ECAL isolation distributions • Combined isolation for very low- / low-pT electrons • Very low pT: 5 – 10 GeV; low pT: 25 – 30 GeV • Prompt electrons from LM1; non-prompt / fake electrons from QCD Weekly UW CMS Meeting - Physics & Trigger

  5. Combined isolation cut efficiency • Eff = N(matched PAT electrons with iso cut) / N(all matched PAT electrons) • Efficiency of “tight” (0.1) / “loose” (0.3) isolation cuts • Prompt electrons from LM1, non-prompt electrons from QCD Weekly UW CMS Meeting - Physics & Trigger

  6. ECAL isolation cut efficiency • Eff = N(matched PAT electrons with iso cut) / N(all matched PAT electrons) • Efficiency of “tight” (0.1) / “loose” (0.3) isolation cuts • Prompt electrons from LM1, non-prompt electrons from QCD Weekly UW CMS Meeting - Physics & Trigger

  7. Electron ET vs. combined isolation • Prompt electrons from LM1; non-prompt / fake electrons from QCD Weekly UW CMS Meeting - Physics & Trigger

  8. Electron ET vs. ECAL isolation • Prompt electrons from LM1; non-prompt / fake electrons from QCD Weekly UW CMS Meeting - Physics & Trigger

  9. Next steps • Create reconstruction efficiencies vs. gen-pT • Reco eff = N(matched PAT electrons) / N(gen electrons) • Make analogous plots for absolute isolation • Start data-driven background estimation Weekly UW CMS Meeting - Physics & Trigger

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