1 / 23

Advanced Analysis Methods for Higgs in Run II

Advanced Analysis Methods for Higgs in Run II. Pushpa Bhat Fermilab. Collaborators: R. Gilmartin H. Prosper Run II SUSY/Higgs Working Group P.B., R.G., H.P., PRD 62, 074022 (2000) Run II Higgs Working Group Report, hep-ph/0010338. Outline. Low mass Higgs M H < 130 GeV/c 2

hong
Download Presentation

Advanced Analysis Methods for Higgs in Run II

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. Advanced Analysis Methods for Higgs in Run II Pushpa Bhat Fermilab Future of Higgs Physics Workshop May 3-5, 2001 Pushpa Bhat

  2. Collaborators: • R. Gilmartin • H. Prosper • Run II SUSY/Higgs Working Group P.B., R.G., H.P., PRD 62, 074022 (2000) Run II Higgs Working Group Report, hep-ph/0010338 Future of Higgs Physics Workshop May 3-5, 2001 Pushpa Bhat

  3. Outline • Low mass Higgs MH < 130 GeV/c2 • WH, ZH Production • Experimental Issues • Signal-background discrimination • b-tagging • Mass resolution • Conclusions Future of Higgs Physics Workshop May 3-5, 2001 Pushpa Bhat

  4. Low Mass Higgs Study • Signals: • Channels: Future of Higgs Physics Workshop May 3-5, 2001 Pushpa Bhat

  5. Signal WH Backgrounds Wbb WZ tqb tb Tt Detector Simulation SHW Networks Jetnet (v3.0) 3 Networks/MH WH vs WZ WH vs Wbb WH vs tt 3 cuts WH  lbb Single Lepton Channel (7,9,1) Network Future of Higgs Physics Workshop May 3-5, 2001 Pushpa Bhat

  6. WH(100 GeV/c2) vs. WbbVariables Future of Higgs Physics Workshop May 3-5, 2001 Pushpa Bhat

  7. WH(100 GeV/c2) NN Distributions Future of Higgs Physics Workshop May 3-5, 2001 Pushpa Bhat

  8. Optimizing Cuts (WH100) Future of Higgs Physics Workshop May 3-5, 2001 Pushpa Bhat

  9. WH(110 GeV/c2) NN Distributions Future of Higgs Physics Workshop May 3-5, 2001 Pushpa Bhat

  10. NN Learning Future of Higgs Physics Workshop May 3-5, 2001 Pushpa Bhat

  11. Discriminating Surface Future of Higgs Physics Workshop May 3-5, 2001 Pushpa Bhat

  12. Standard vs. NN Future of Higgs Physics Workshop May 3-5, 2001 Pushpa Bhat

  13. Combined Network NN1 WH-Wbb NN2 WH-WZ NN4 NN3 WH-top NN4= f (NN1,NN2,NN3) • Use in fitting distributions • Use in mass measurement Future of Higgs Physics Workshop May 3-5, 2001 Pushpa Bhat

  14. Combined Network (WH110) Currently see no improvement in significance by fitting the NN distributions for single lepton channel. This is work in progress Future of Higgs Physics Workshop May 3-5, 2001 Pushpa Bhat

  15. bottomcharmprimary Points- single m data, black - fit. b-Tagging • LEP experiments have impressive b-tagging using Neural Networks • Use Neural Networks to combine lifetime and kinematic variables • Work in progress at CDF & DØ • R. Demina • S. Repond (ACAT2K Proceedings) Future of Higgs Physics Workshop May 3-5, 2001 Pushpa Bhat

  16. Jet Energy Corrections Correct jet energy using transverse energy and eta. Use NN to fit the correction function  Future of Higgs Physics Workshop May 3-5, 2001 Pushpa Bhat

  17. Mass Future of Higgs Physics Workshop May 3-5, 2001 Pushpa Bhat

  18. Higgs Mass Fits S= 80 WH events Wbb used as Background S/B =1/10 Mfit =114 11 GeV/c2 S/B =1/5 Mfit =114  7 GeV/c2 Ref.: P.B., H.P. S.Snyder, PLB 407, 73 (1997) Future of Higgs Physics Workshop May 3-5, 2001 Pushpa Bhat

  19. Work in Progress • Systematic selection of variables • Continue study of b-tagging, mass resolution • Fit distributions instead of counting above cuts, and use new results in all channels • Continue to develop Bayesian method for combining channels. • Study effect of various systematic uncertainties on discovery reach. Future of Higgs Physics Workshop May 3-5, 2001 Pushpa Bhat

  20. Conclusions • Finding Higgs at the Tevatron will be extremely challenging! • As evidenced from work at LEP, we will need all the sophistication in analysis that we can acquire. Future of Higgs Physics Workshop May 3-5, 2001 Pushpa Bhat

  21. Back-up Slides Future of Higgs Physics Workshop May 3-5, 2001 Pushpa Bhat

  22. Mbb HT Future of Higgs Physics Workshop May 3-5, 2001 Pushpa Bhat

  23. Higgs Mass Resolution Use mjj and HT (= Etjets ) to train NNs to predict the Higgs boson mass 13.8% 12.2% 13.1% 11..3% 13% 11% Future of Higgs Physics Workshop May 3-5, 2001 Pushpa Bhat

More Related