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Update on W→μν Analysis with Int. Luminosity of 3.1 pb⁻¹: University of Michigan

This report presents the latest analysis of the W→μν channel with an integrated luminosity of 3.1 pb⁻¹. Conducted by researchers from the University of Michigan, it details the Staco and Muid event selection methods, providing observed data, estimated signal, and background calculations. The study highlights uncertainties related to luminosity, signal acceptance, and background estimations. The estimated W→μν cross-section is calculated using multiple reconstruction algorithms, contributing valuable insights into Standard Model predictions and validating experimental results at the Diboson Meeting on 09/17/2010.

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Update on W→μν Analysis with Int. Luminosity of 3.1 pb⁻¹: University of Michigan

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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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