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Muon Isolation Update at University of Arizona: Signal and Background Analysis

This report presents an update on muon isolation analyses from the University of Arizona, focusing on Z, Zj, and Zjj data. The signal sample consists of events with two muons and specific cuts on transverse momentum (PT), isolation, and dimuon mass; results are analyzed for distributions of isolated muons. Background samples are evaluated using similar cuts with different thresholds. Efficiency metrics highlight the relationship between PT cuts and isolation variables. Data-MC comparisons reveal signal and track efficiencies essential for improving isolation criteria in muon studies.

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Muon Isolation Update at University of Arizona: Signal and Background Analysis

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  1. Muon Isolation Update Ken Johns University of Arizona

  2. Z, Zj, Zjj Data = “Signal” • Sample • Emily Z skim • Cuts • Good vertex • 2 muons with PT > 15 GeV/c • 1 isolated muon • Same vertex • Muon phi (highest PT) – metphi < 165 degrees • Corrected MET < 15 GeV • 75 < dimu mass < 105 GeV/c2 • 0, 1, >1 jets with ET > 20 GeV • Look at distributions of the “other” muon

  3. bb p13 Data = “Background” • Sample • Dimu p13 skim • Cuts • Good vertex • 2 muons with PT > 6 GeV/c • // ΔR > 0.5 between the two muons • 1 muon with an associated jet • Same vertex • Muon phi (highest PT) – metphi < 165 degrees • Corrected MET < 15 GeV • 0 < dimu mass < 70 GeV/c2 • >1 jets with ET > 20 GeV • Look at distributions of the “other” muon

  4. bb rat efficiency = f(Ptmu) • Rat == Halo11 / Ptmu • Let Ptmu = 6, 10, 12, 15 GeV/c • Define Rat cut where background efficiency = 10% • 6 GeV/c = 0.32 • 10 GeV/c = 0.30 • 12 GeV/c = 0.28 • 15 GeV/c = 0.25 • => Only slowly varying with Ptcut • => But other isolation variables change slightly with Ptmu cut as well (statistics?)

  5. Signal Efficiency • Signal efficiency for 10% background (bb) efficiency • Use 12 GeV/c cut sample for bb background (more statistics than 15 GeV/c) • (Arbitrarily) set background efficiency to 10% • Halo11 efficiency for signal (@3.8) = 75% • Trkpt efficiency for signal (@2.0) = 50% • Rat efficiency for signal (@0.28) = 92% • dR efficiency for signal (@0.5) = 75% • Rat still in the running as isolation variable • Note dR inefficiency as well • n.b. previous efficiencies used Ptmu = 6 GeV/c to determine bb cut points

  6. p14 Zjj Data-MC Isolation Comparison • Pick signal efficiency = 90% • Ask what cut value gives this efficiency • Here Ptmu cut = 15 GeV/c • Halo11 • Data = 6.4, MC = 3 • Trkpt • Data = > 10, MC = 4 • Rat • Data = 0.35, MC = 0.1

  7. Zjj Data – Halo 11

  8. Zjj MC – Halo11

  9. Zjj Data – Trkpt

  10. Zjj MC– Trkpt

  11. Zjj Data – Rat

  12. Zjj MC – Rat

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