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Some D0 MeetingDecember 2003
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%
Some D0 MeetingDecember 2003
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%
Some D0 MeetingDecember 2003
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
Some D0 MeetingDecember 2003
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