1 / 17

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

garron
Download Presentation

ttbar  τ + jets : Update on QCD Estimation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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. Results Rerunning Analysis Using Old Code • Run 1: • chi-squared: 26.75 • signal fraction: 0.7744 +/- 0.0742 • Rescale signal MC in all regions and rerun: • chi-squared: 25.51 • signal fraction: 0.7747+/- 0.0702

  5. Highest pTbjet reconstruction • Chi2: 14.46 • NDF: 9 • Chi2/NDF: 1.607

  6. 2nd highest pTbjet reconstruction • Chi2: 7.534 • NDF: 9 • Chi2/NDF: 0.8371

  7. Dijet reconstruction • Chi2: 7.524 • NDF: 11 • Chi2/NDF: 0.6840

  8. Closest Top mass reconstruction • Chi2: 11.70 • NDF: 8 • Chi2/NDF: 1.463

  9. Oddity

  10. Back-up

  11. 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

  12. 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

  13. Highest pTbjet reconstruction June 6 Old Code

  14. 2nd highest pTbjet reconstruction June 6 Old Code

  15. Dijet reconstruction June 6 Old Code

  16. Closest Top mass reconstruction June 6 Old Code

  17. 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

More Related