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Update on W  mn Analysis with Int. Lumi . of 3.1 pb -1

Update on W  mn Analysis with Int. Lumi . of 3.1 pb -1. Xuefei Li Jianbei Liu, Yusheng Wu, Haijun Yang, Bing Zhou and Junjie Zhu The University of Michigan UM Diboson Meeting 09/17/2010. Int. Luminosity Calculation for W  mn (A-E: L1_MU6, F: L1_MU10).

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Update on W  mn Analysis with Int. Lumi . of 3.1 pb -1

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  1. Update on WmnAnalysis with Int. Lumi. of 3.1 pb-1 XuefeiLi Jianbei Liu, Yusheng Wu, Haijun Yang, Bing Zhou and Junjie Zhu The University of Michigan UM Diboson Meeting 09/17/2010

  2. Int. Luminosity Calculation for Wmn(A-E: L1_MU6, F: L1_MU10)

  3. Staco Event Selection from A-F W+ / W- ratio from Data (SM ~ 1.5)

  4. MuidEvent Selection from A-F W+ / W- ratio from Data (SM ~ 1.5)

  5. Summary of Observed Data and Estimated Signal and Backgrounds for 3.1 nb-1

  6. Summary of Observed Data and Estimated Signal and Backgrounds for 3.1 nb-1

  7. Systematic Uncertainties • Luminosity Uncertainty: ~ 11% • Signal Acceptance Uncertainty: ~ 6.2% • Trigger efficiency uncertainty ~ 3% (from trigger study) • MET Acceptance ~ 3% • Muon ID ~ 2% • MC@NLO / Pythia, 4% • Background Estimation Uncertainty: • QCD Jet background uncertainty ~ 50% • Wtn, Zmm, Ztt, ttbar uncertainty ~ 5% 7

  8. Estimation of WmnCross Section (3.1 pb-1) SM W  mn cross-section: 10.46 nb (NNLO) • = (Nobs- Nb) / (L x Acc) • Using StacoMuon Reconstruction Algorithm (W+): s = 5.69nb ± 0.07 (stat) ± 0.72 (syst) • Using StacoMuon Reconstruction Algorithm (W-): s = 3.81nb ± 0.06 (stat) ± 0.48 (syst) • Using StacoMuon Reconstruction Algorithm (Inclusive): s = 9.50nb ± 0.09 (stat) ± 1.20 (syst) 8

  9. Estimation of WmnCross Section (3.1 pb-1) SM W  mn cross-section: 10.46 nb (NNLO) • = (Nobs- Nb) / (L x Acc) • Using MuidMuon Reconstruction Algorithm (W+): s = 5.66nb ± 0.07 (stat) ± 0.71 (syst) • Using MuidMuon Reconstruction Algorithm (W-): s = 3.75nb ± 0.05 (stat) ± 0.47 (syst) • Using MuidMuon Reconstruction Algorithm (Inclusive): s = 9.44nb ± 0.09 (stat) ± 1.19 (syst) 9

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