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Muon Isolation Update

Muon Isolation Update. Ken Johns University of Arizona. Conclusions. p13 vs p14 (not42) ~2x events in p14 Halo11 efficiency improves (70% vs 55%) Little effect on Trkpt and Rat efficiency p14 (t42) vs p14 (not42) 25% less events Halo11 and Rat efficiency unchanged (70%)

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Muon Isolation Update

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  1. Muon Isolation Update Ken Johns University of Arizona

  2. Conclusions • p13 vs p14 (not42) • ~2x events in p14 • Halo11 efficiency improves (70% vs 55%) • Little effect on Trkpt and Rat efficiency • p14 (t42) vs p14 (not42) • 25% less events • Halo11 and Rat efficiency unchanged (70%) • Trkpt efficiency improves?? (75% vs 55%) • Background efficiency • For comparison, set background efficiency to 10% • Halo11 efficiency for signal = 55% • Trkpt efficiency for signal = 38% • Rat efficiency for signal = 92% • dR efficiency for signal = 50%

  3. Conclusions • Rat = Halo11 / Ptmu • Let Ptmu = 6, 10, 12, 15 GeV/c • Find 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 • => Slowly varying with Ptcut • => But other variables change with Ptmu cut as well (statistics?) • Signal efficiency for 10% background efficiency • Use 12 GeV/c cut sample for all background variables • For comparison, 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%

  4. Z, Zj, Zjj Data • 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

  5. Halo 11 (p13 vs p14-not42)

  6. Trkpt (p13 vs p14-not42)

  7. Rat (p13 vs p14-not42)

  8. Halo11 p14 (not42 vs t42)

  9. Trkpt p14 (not42 vs t42)

  10. Rat p14 (not42 vs t42)

  11. bb p13 Data • 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

  12. Halo11 (Zjj vs bb)

  13. Trkpt (Zjj vs bb)

  14. Rat (Zjj vs bb)

  15. dr (Zjj vs bb)

  16. Next Steps • With signal and background efficiencies we can proceed to the using the matrix method • tt to mumu cuts with no HT cut and MET > 20 GeV cut • Like sign and unlike sign • Develop muon isolation likelihood • Cross-check bb distributions using single muon sample

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