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Report Jet-veto SF and Uncertainties Jet smearing

Report Jet-veto SF and Uncertainties Jet smearing. Lailin Xu, Haijun Yang, Bing Zhou The University of Michigan. Outline. Jet-veto SF and uncertainties Effects of Jet smearing on MET MET with/without METUtility WW/top/tautau background uncertainties. Jet Veto SF and Uncertainties.

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Report Jet-veto SF and Uncertainties Jet smearing

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  1. ReportJet-veto SF and UncertaintiesJet smearing Lailin Xu, Haijun Yang, Bing Zhou The University of Michigan

  2. Outline • Jet-veto SF and uncertainties • Effects of Jet smearing on MET • MET with/without METUtility • WW/top/tautau background uncertainties

  3. Jet Veto SF and Uncertainties • SF =eZZ(data)/ eZZ(MC) = eZ(data)/eZ(MC) • Control samples: Data (p833, 4.7 fb-1) Z ee and Z mm MC (MC11C): Z ll MC@NLO/Herwig, ALPGEN, PYTHIA • Systematic uncertainties • Parton showing modeling (with diff. MC generator) • JES/JER (using ATLAS package to smear jet ET)

  4. Jet-veto SF Results • SF = 0.96 (both for ee and for mm) from MC@LNO Z MC  compared to WW analysis: SF = 0.963 • Systematic uncertainty • < 0.3% due to JES/JER • ~ 5% due to different MC generator (Alpgen gives SF = 1.00; Pythia gives SF = 1.02)

  5. Jet smearing effects on MET:ee With jet smearing (for all the EM-jets by hand) Compared to no jet smearing

  6. Jet smearing effects on MET:mm With jet smearing (for all the EM-jets by hand) Compared to no jet smearing

  7. MET with METUtility:ee MET with the Tool Compared to without tool

  8. MET with METUtility:mm MET with the Tool MET without the Tool

  9. WW/top/tautau background estimation method formular: are efficiency factor for ee and mm events Here Z+jets is the DY contribution without Ztautau

  10. Cut flow for ee (final 34 events)

  11. Cutflow:mm (final 45 events)

  12. Cut flow em (final numner 15)

  13. estimated background after all cuts

  14. Error propagation in data driven method

  15. back up

  16. Compared to no jet smearing

  17. With jet smearing for all EM jets (by hand)

  18. Compared to no jet energy smearing

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