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QCD Estimation Update: New Fit Selection Results

Update on QCD estimation results with new fit selection outcomes for τ+, jets analysis by William Edson from SUNY at Albany. Includes signal fraction, corrected results, systematic corrections, MC generator details, backup QCD template, correlation plots, linearity tests, MC Tau plots, normalized samples, ensemble tests, cutflow details, and event selection verification excluding QCD.

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QCD Estimation Update: New Fit Selection Results

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

  2. Fit Selection Results • New Results for Fit: • Signal Fraction: 0.691497±0.0411817 • Chi2: 28.25 • Meas. Used: 31 • σ: 166.798±9.93353 • New Corrected Results: • Signal Fraction: ± 0.0411817 • σ: ± 9.93353 • Correction Systematic: ±

  3. Systematics Contd.

  4. Top Mass

  5. 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)

  6. Back-up

  7. QCD Template: Correlation Plots

  8. Oddity? MET Dijet Mass

  9. Oddity? MET Dijet Mass

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

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

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

  13. Mean Values of Ensemble Fits

  14. Adjust Range for Linear Fit?

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

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

  17. Fits/Hists for Ensemble Tests

  18. 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

  19. 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

  20. 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

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

  22. 2nd Highest pTbjet reconstruction • Results for plot: • chi-square: 13.66 • p-value: 0.5517 • ndf: 15 • chi/ndf: 0.9107

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

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

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

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

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