ttbar jets update on qcd estimation n.
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ttbar  τ + jets : Update on QCD Estimation. William Edson SUNY at Albany. Chi-squared minimization. Equation: N(x): total number of events of type x for distribution n(x) i : number of events in bin of type x frac (Sig): fraction of N(Remain) expected to be Signal

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chi squared minimization
Chi-squared minimization
  • Equation:
    • N(x): total number of events of type x for distribution
    • n(x)i: number of events in bin of type x
    • frac(Sig): fraction of N(Remain) expected to be Signal
    • binfrac(x)i: fraction of events in bin of type x expected from MC or template
    • σi: uncertainty in bin i
chi squared minimization cont
Chi-squared minimization cont.
  • σi determined by adding in quadrature
    • bin error:
      • data
      • signal, MC
      • QCD template
      • other backgrounds, MC
    • statistical error:
      • data: signal region (times 2)
      • data: background region
      • other backgrounds, MC (times 2)
      • signal, MC
      • signal and other backgrounds combined, MC: background region
results
Results
  • Chi-square: 3.747
  • signal fraction: 0.91933 +/- 0.157592
  • signal fraction for all data: 0.819601
ensemble tests with result signal fraction
Ensemble tests with result signal fraction

Results with Gaussian Fit

Associated Errors

Mean: 0.764889 +/- 0.002659 Sigma: 0.0805555 +/- 0.0020661

linear fit with signal fraction from 0 1 0 8
Linear Fit with Signal Fraction from 0.1 - 0.8

y(0): -0.00998677 +/- 0.05173513

slope: 0.912698 +/- 0.1009633

proceeding acceptance and efficiency work
Proceeding Acceptance and Efficiency Work
  • Efficiency: Limiting to events in 105200 sample satisfying:
    • contain truth matched taus
    • single prong
    • muonVeto and eleBDTMedium == 0
    • calo-seeded taus
  • Acceptance: Using all MC types
    • Nrec: MC events passing entire cutflow
    • Ngen: 105200 events using mc and trueTau branch information matched to single prong, BDTJetScore > 0.7 taus
highest p t bjet reconstruction
Highest pTbjet reconstruction
  • Results for plot:
    • chi-square: 7.341
    • p-value: 0.7709
    • ndf: 11
    • chi/ndf: 0.6674
2 nd highest p t bjet reconstruction
2nd highest pTbjet reconstruction
  • Results for plot:
    • chi-square: 13.76
    • p-value: 0.3166
    • ndf: 12
    • chi/ndf: 1.147
dijet reconstruction
Dijet reconstruction
  • Results for plot:
    • chi-square: 6.133
    • p-value: 0.8643
    • ndf: 11
    • chi/ndf: 0.5575
closest top mass reconstruction
Closest Top mass reconstruction
  • Results for plot:
    • chi-square: 5.342
    • p-value: 0.8035
    • ndf: 9
    • chi/ndf: 0.5936
cutflow
Cutflow
  • C0: GRL
  • C1: Trigger
  • C2: Primary vertex with ntracks > 4
  • C3: Electron/muon overlap, larVeto
  • C4: Jet cleaning
  • C5: Lepton Veto
  • C6: njets >= 4 with eta < 2.5 and |jvf| > 0.75
  • C7: MET > 60GeV
  • C8: MT < 70GeV
  • C9: Sum ET < 500GeV
  • C10: >= 1 bjet
  • C11: Tau n ≥ 1, BDTScore > 0.7
  • C12: Trigger matched tau n ≥ 1 and pT >= 40GeV
  • C13: MC tau object match