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Muon Isolation Update at Ken Johns University of Arizona

This update highlights the findings of the study on muon isolation efficiency at Ken Johns University of Arizona. The research explores the impact of various factors on Halo11, Trkpt, and Rat efficiencies, comparing events and signal efficiencies across different Ptmu values. Moreover, the data from Z, Zj, Zjj, and bb samples are analyzed with specific cuts and criteria to provide insights into the distributions of muon variables. The study also discusses the next steps, including utilizing the matrix method and developing a muon isolation likelihood for further analysis.

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Muon Isolation Update at Ken Johns University of Arizona

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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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