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Muon Isolation Studies

Muon Isolation Studies. Ken Johns University of Arizona. Conclusions. Isolation variables depend on event topology Z vs Zj vs Zjj Assumes Zj and Zjj samples are relatively pure Current isolation criteria is inefficient dR and Halo11/Pt(muon) better? Matrix method in progress

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Muon Isolation Studies

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  1. Muon Isolation Studies Ken Johns University of Arizona

  2. Conclusions Isolation variables depend on event topology • Z vs Zj vs Zjj • Assumes Zj and Zjj samples are relatively pure • Current isolation criteria is inefficient • dR and Halo11/Pt(muon) better? • Matrix method in progress • Have signal efficiencies but need additional background events for background efficiencies • Apply to events outside Z mass region to estimate signal and background

  3. Z, Zj, Zjj Data • Sample • Emily Z skim (2 muons, 1 loose, 1 matched track, other cuts?) • Cuts • Good vertex • 2 muons with PT > 15 GeV/c • 1 isolated muon • Same vertex • Muon phi (highest PT) – metphi < 165 degrees • 75 < dimu mass < 105 GeV/c2 • 0, 1, >1 jets with ET > 20 GeV

  4. Z, Zj, Zjj Data • Plots are for isolation variables for the second muon (no isolation requirement) • Trkpt • Halo11 • DCA • dR to closest jet • dedx • Trkdr • Rat11 == Halo11 / Pt(muon)

  5. Z Data (Halo 11)

  6. Zj Data (Halo 11)

  7. Zjj Data (Halo 11)

  8. Z Data (TrkPt)

  9. Zj Data (TrkPt)

  10. Zjj Data (TrkPt)

  11. Zjj Data (Rat11)

  12. ttmumu MC (Halo 11)

  13. ttmumu MC (TrkPt)

  14. ttmumu MC (dR)

  15. ttmumu MC (Rat11)

  16. Zjj Data (Emily skim)

  17. Zjj Data (dimu skim)

  18. bb Data (like sign)

  19. bb Data (unlike sign)

  20. Z, Zj, Zjj Data • Sample • Dimu skims • Cuts • Good vertex • 2 muons with PT > 15 GeV/c • 1 isolated muon • Same vertex • Muon phi (highest PT) – metphi < 165 degrees • 75 < dimu mass < 105 GeV/c2 • 0, 1, >1 jets with ET > 20 GeV

  21. bb Data • Sample • Dimu skims • Good vertex • 2 muons with PT > 10 GeV/c • 2 jets with ET > 20 GeV • Each muon is within dR < 0.5 of a jet • Same vertex • Muon phi (highest PT) – metphi < 165 degrees • 50 < dimu mass < 120 GeV/c2 • Sometimes only like sign muons are required

  22. Zjj Data (dR)

  23. Zj Data (dR)

  24. Z Data (DCA)

  25. Zj Data (DCA)

  26. Zjj Data (DCA)

  27. b-bbar Data (Halo 11)

  28. b-bbar Data (TrkPt)

  29. b-bbar Data (Rat11)

  30. Zjj MC (Halo 11)

  31. Zjj MC (TrkPt)

  32. Zjj MC (dR)

  33. Zjj MC (Rat11)

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