ttbar  τ + jets : Update on QCD Estimation

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

2. Only MET and Dijet Mass Fit Selection • New Results for Fit: • Signal Fraction: 0.664442±0.0418289 • Chi2: 29.953 • Meas. Used: 31 • σ: 170.884±10.7578 • New Corrected Results: • Signal Fraction: 0.685204± 0.0418289 • σ: 176.223 ± 10.7578 • Correction Systematic: ±3.87838

4. Cutflows

5. Systematics Contd.

6. Top Mass Original kfac/σ(FE) from TopMC11 twiki Correction using Ref σ’s Using kfac/σ(FE) from 105200

7. MC Generator 1.1)fullsim mc11c POWHEG+fPythia sample 117050 (SYST_Full_117050) and MC@NLO+fHerwig sample 105200 (MC@NLO(105200)) 1.2)fullsim mc11c POWHEG+fPythia sample 117050 (SYST_Full_117050) and the fullsim mc11c ALPGEN+HERWIG samples (AlpHerwig(baseline)) 1.3) AtlFast2 mc11b POWHEG+fPythia sample 117050 (SYST_AtF_117050) POWHEG+fHerwig sample 105860 (SYST_AtF_105860)

8. QCD Template: Divided Control Region

9. QCD Template: Correlation Plots

10. Oddity? MET Dijet Mass

11. Oddity? MET Dijet Mass

12. Back-up

13. for (unsigned inttfj = (tau_matched.size() - 1); tfj > 0; tfj--) { try { int REFN1 = tau_matched.at(tfj).entry(); int REFN2 = tau_matched.at(tfj-1).entry(); if( (physics->tau_BDTJetScore->at(REFN1)) > (physics->tau_BDTJetScore->at(REFN2))) { save = tau_matched.at(tfj); tau_matched.at(tfj) = tau_matched.at(tfj-1); tau_matched.at(tfj-1) = save; } } catch (conststd::out_of_range& C12_2){ std::cerr << endl << "C12.2: OUT OF RANGE ERROR: " << C12_2.what() << endl; EMERXIT = 12; continue; } }

14. QCD Bin/Range Range increases/decreases in steps of 20GeV Bin amount increases/decreases in steps of 5

15. Y(0): -0.186462 ± 0.0013857 Slope: 1.23971 ± 0.00246245 Chi2: 32.7364 NDF: 8998 Linearity Testto All Values

16. Linearity Testto Means Slope: 1.23772 ± 0.0351884 y-intercept: -0.184483 ± 0.0198016 Chi2: 0.00520053 NDF: 7

17. Mean Values of Ensemble Fits

18. Adjust Range for Linear Fit?

19. MC Tau Plots MC Tau Children Count MC Tau Count MC Tau Children pdgID LeptonicpdgID values: e → 11, μ → 13, τ → 15

20. MT Signal vs Control vs MC Backgrounds Samples Normalized to Own Integrals Samples Normalized to Sum of Integrals

21. Fits/Hists for Ensemble Tests

22. Cutflow • C0: GRL • C1: Trigger • C2: Primary vertex with ntracks > 4 • C3: Electron/muon overlap • C4: Jet cleaning • C5: Lepton Veto • C6: tau n ≥ 1 • C7: njets >= 4 with eta < 2.5 and |jvf| > 0.75 • C8: MET > 60GeV • C9: MT < 80GeV • C10: >= 1 bjet • C11: Trigger matched tau n ≥ 1 and pT >= 40GeV • C12: MC tau object match

23. 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

24. Chi-squared minimization cont. • σi determined using factors for: • bin error: • data • signal, MC • QCD template • other backgrounds, MC • statistical error: • data: signal region • other backgrounds, MC • signal, MC • QCD template (uncertainty of background region data and all MC background region carried through via default SumW2

25. Highest pTbjet reconstruction • Results for plot: • chi-square: 9.818 • p-value: 0.7753 • ndf: 14 • chi/ndf: 0.7012

26. 2nd Highest pTbjet reconstruction • Results for plot: • chi-square: 13.66 • p-value: 0.5517 • ndf: 15 • chi/ndf: 0.9107

27. Dijet Mass reconstruction • Results for plot: • chi-square: 15.47 • p-value: 0.6297 • ndf: 18 • chi/ndf: 0.8594

28. MET • Results for plot: • chi-square: 15.87 • p-value: 0.1971 • ndf: 12 • chi/ndf: 1.323

29. Closest pTbjet reconstruction • Results for plot: • chi-square: 14.39 • p-value: 0.2123 • ndf: 11 • chi/ndf: 1.308

30. New Event Selection Verification (Only uses MC so Excludes QCD)