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Muon Efficiency for Lepton Charge Asymmetry

This study examines muon efficiency in the context of lepton charge asymmetry, measuring the efficiency for μ+ and μ- as a function of pT, η, and charge. Using the Tag & Probe method with Z events, the efficiency scale factors are applied to data from the 2011A dataset (∫Ldt = 2.1 fb-1) and compared to Monte Carlo simulations (Madgraph, Z → l+l-). The results indicate that the efficiency ratio of μ+ to μ- is close to 1.0, contributing to systematic studies relevant for ongoing analysis of lepton charge asymmetry phenomena.

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Muon Efficiency for Lepton Charge Asymmetry

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  1. Muon Efficiency for Lepton Charge Asymmetry • Jiyeon Han (Univ. of Rochester) • on behalf of Lepton charge asymmetry group

  2. Muon Efficiency Study • Muon efficiency study for lepton charge asymmetry analysis • Lepton charge asymmetry is defined as • We measure A(η) from the number of events for W+ and W- • It is important to measure the efficiency for μ+ and μ-, respectively • Muon efficiency is estimated as a function of pT, η, and charge • Efficiency is estimated using Tag & Probe method using Z events • Efficiency scale factor of data to MC in pT and η is applied in MC • Efficiency scale factor in charge is used for the systematic study • Efficiency for 2011A data set • Data : 2011A data set ( IsoMu_24 and IsoMu_15), ∫Ldt = 2.1 fb-1 • MC : Madgraph (inclusive Drell-Yan MC : Z→l+l-) • Muon Id : VBTF standard selection excluding isolation cut

  3. Efficiency in Data vs MC • The muon reconstruction efficiency in (pT, η, Q) : include trigger effi. : Data for μ+ : Data for μ- : Efficiency is low from trigger thresold (24 GeV) : MC for μ+ : MC for μ-

  4. |η| Bin Fit Result (Data) |η| Bin Fit Result (Data) 0.00 - 0.20 0.9890 ± 0.0033 1.20 - 1.40 1.0034 ± 0.0045 0.20 - 0.40 0.9995 ± 0.0042 1.40 - 1.60 1.0007 ± 0.0047 0.40 - 0.60 0.9967 ± 0.0031 1.60 - 1.85 0.9946 ± 0.0050 0.60 - 0.80 0.9976 ± 0.0033 1.85 - 2.10 0.9883 ± 0.0053 0.80 - 1.00 1.0046 ± 0.0047 2.10 - 2.40 0.9962 ± 0.0080 1.00 - 1.20 1.0027 ± 0.0044 Efficiency Ratio of μ+ to μ- • We measure the efficiency ratio of μ+ to μ- for the systematic study Muon pT for lepton charge asymmetry is pT > 25 GeV Fit the scale factor of μ+/μ- in pT > 25 GeV ⇒ close to 1.0 The scale factor of μ+/μ- is used for the systematic study

  5. Summary • We keep working on the efficiency study for lepton charge asymmetry • Consider pT, η, and charge dependence • Total efficiency includes tracking, muon recon., ID, trigger efficiency • The efficiency scale factor of data to MC is applied into MC • The charge dependence is used for the systematic study • The scale factor of μ+ to μ- is closed to be 1.0 within stat. uncertainty

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