ttbar jets Update on QCD Estimation William Edson
ttbar τ + jets: Update on QCD Estimation William Edson SUNY at Albany
Cutflow � � � � C 0: GRL C 1: Trigger C 2: Primary vertex with ntracks > 4 C 3: Electron/muon overlap, lar. Veto C 4: Jet cleaning C 5: Lepton Veto C 6: njets >= 4 with eta < 2. 5 and |jvf| > 0. 75 C 7: MET > 60 Ge. V C 8: MT < 70 Ge. V C 9: Sum ET < 500 Ge. V C 10: >= 1 bjet C 11: Tau n ≥ 1, BDTScore > 0. 7 C 12: Trigger matched tau n ≥ 1 and p. T >= 40 Ge. V C 13: MC tau object match
Chi-squared minimization � Equation: � nx: number of events in bin of type x � sf. Sig, QCD: scale factor for either Signal or QCD � σi: uncertainty added in quadrature for bin i for all types (QCD, Sig and Othr. Back) � � sf. Sig = 1. 833 ± 0. 08235 sf. QCD = 1. 05018 ± 0. 0800807
Second bjet Top Mass ABCD Result TFraction. Fit Result Chi-squared minimization
Highest p. T bjet Top Mass ABCD Result TFraction. Fit Result Only adding template
Dijet Mass ABCD Result TFraction. Fit Result Chi-squared minimization
Closest Top Mass ABCD Result TFraction. Fit Result Chi-squared minimization
Back-up
ABCD Regions � Signal Region (A): � BDTScore � > 0. 7 and Closest Top Mass < 230 Ge. V Background Regions (B, C and D): � B: BDTScore < 0. 7 and Closest Top Mass < 230 Ge. V � C: BDTScore > 0. 7 and Closest Top Mass > 230 Ge. V � D: BDTScore < 0. 7 and Closest Top Mass > 230 Ge. V
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