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ttbar  τ + jets : Update on QCD Estimation

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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ttbar  τ + jets : Update on QCD Estimation

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  1. ttbarτ + jets:Update on QCD Estimation William Edson SUNY at Albany

  2. 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

  3. 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

  4. Highest pTbjet reconstruction June 6 After Smearing Debug (7-23) Reapplying bug, Package Fallback, Removing Systematics code

  5. 2nd highest pTbjet reconstruction Reapplying bug, Package Fallback, Removing Systematics code June 6 After Smearing Debug (7-23)

  6. Dijet reconstruction June 6 After Smearing Debug (7-23) Reapplying bug, Package Fallback, Removing Systematics code

  7. Closest Top mass reconstruction Reapplying bug, Package Fallback, Removing Systematics code June 6 After Smearing Debug (7-23)

  8. Back-up

  9. Results • Run 1: • chi-squared: 31.78 • signal fraction: 0.7415 +/- 0.0823 • Rescale signal MC in all regions and rerun: • chi-squared: 30.94 • signal fraction: 0.7400+/- 0.0792

  10. Results • Run 1: • chi-squared: 4.541 • signal fraction: 0.9891+/- 0.1460 • Rescale signal MC in all regions and rerun: • chi-squared: 3.905 • signal fraction: 0.9787+/- 0.1233

  11. 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

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