some d0 meeting november 2003 muon isolation studies ken johns university of arizona

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Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

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Page 1: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

Muon Isolation Studies

Ken JohnsUniversity of Arizona

Page 2: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

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

Page 3: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

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

Page 4: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

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)

Page 5: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

Z Data (Halo 11)

Page 6: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

Zj Data (Halo 11)

Page 7: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

Zjj Data (Halo 11)

Page 8: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

Z Data (TrkPt)

Page 9: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

Zj Data (TrkPt)

Page 10: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

Zjj Data (TrkPt)

Page 11: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

Zjj Data (Rat11)

Page 12: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

ttmumu MC (Halo 11)

Page 13: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

ttmumu MC (TrkPt)

Page 14: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

ttmumu MC (dR)

Page 15: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

ttmumu MC (Rat11)

Page 16: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

Zjj Data (Emily skim)

Cut Passing

Old isolation loose 33

Old isolation tight 17

New isolation loose(dR > 0.2 and Rat11 < 0.35)

29

New isolation tight 28

New isolation loose (no dR)

37

New isolation tight (no dR)

35

Page 17: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

Zjj Data (dimu skim)

Cut Passing

Old isolation loose 65

Old isolation tight 44

New isolation loose 76

New isolation tight 61

New isolation loose (no dR)

85

New isolation tight (no dR)

76

Page 18: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

bb Data (like sign)

Cut Passing

Old isolation loose 0

Old isolation tight 0

New isolation loose 0

New isolation tight 0

New isolation loose (no dR)

10

New isolation tight (no dR)

1

Page 19: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

bb Data (unlike sign)

Cut Passing

Old isolation loose 3

Old isolation tight 0

New isolation loose 1

New isolation tight 0

New isolation loose (no dR)

12

New isolation tight (no dR)

4

Page 20: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

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

Page 21: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

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

Page 22: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

Zjj Data (dR)

Page 23: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

Zj Data (dR)

Page 24: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

Z Data (DCA)

Page 25: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

Zj Data (DCA)

Page 26: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

Zjj Data (DCA)

Page 27: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

b-bbar Data (Halo 11)

Page 28: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

b-bbar Data (TrkPt)

Page 29: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

b-bbar Data (Rat11)

Page 30: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

Zjj MC (Halo 11)

Page 31: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

Zjj MC (TrkPt)

Page 32: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

Zjj MC (dR)

Page 33: Some D0 Meeting November 2003 Muon Isolation Studies Ken Johns University of Arizona

Some D0 MeetingNovember 2003

Zjj MC (Rat11)