some d0 meeting november 2003 muon isolation studies ken johns university of arizona
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Some D0 MeetingNovember 2003
Muon Isolation Studies
Ken JohnsUniversity 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
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
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)
Some D0 MeetingNovember 2003
Z Data (Halo 11)
Some D0 MeetingNovember 2003
Zj Data (Halo 11)
Some D0 MeetingNovember 2003
Zjj Data (Halo 11)
Some D0 MeetingNovember 2003
Z Data (TrkPt)
Some D0 MeetingNovember 2003
Zj Data (TrkPt)
Some D0 MeetingNovember 2003
Zjj Data (TrkPt)
Some D0 MeetingNovember 2003
Zjj Data (Rat11)
Some D0 MeetingNovember 2003
ttmumu MC (Halo 11)
Some D0 MeetingNovember 2003
ttmumu MC (TrkPt)
Some D0 MeetingNovember 2003
ttmumu MC (dR)
Some D0 MeetingNovember 2003
ttmumu MC (Rat11)
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
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
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
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
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
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
Some D0 MeetingNovember 2003
Zjj Data (dR)
Some D0 MeetingNovember 2003
Zj Data (dR)
Some D0 MeetingNovember 2003
Z Data (DCA)
Some D0 MeetingNovember 2003
Zj Data (DCA)
Some D0 MeetingNovember 2003
Zjj Data (DCA)
Some D0 MeetingNovember 2003
b-bbar Data (Halo 11)
Some D0 MeetingNovember 2003
b-bbar Data (TrkPt)
Some D0 MeetingNovember 2003
b-bbar Data (Rat11)
Some D0 MeetingNovember 2003
Zjj MC (Halo 11)
Some D0 MeetingNovember 2003
Zjj MC (TrkPt)
Some D0 MeetingNovember 2003
Zjj MC (dR)
Some D0 MeetingNovember 2003
Zjj MC (Rat11)
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