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Simulation and Reconstruction of H → WW → e ν jj CMSSW 0_8_0

Simulation and Reconstruction of H → WW → e ν jj CMSSW 0_8_0. Kira Grogg UW-Madison Sept. 7, 2006. Outline. Finding electrons -- overview of cuts Δ r and energy ratios Reconstructed electrons Et, pt, eta, phi Comparison between reconstructed and generated electrons

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Simulation and Reconstruction of H → WW → e ν jj CMSSW 0_8_0

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  1. Simulation and Reconstruction ofH→WW→eνjjCMSSW 0_8_0 Kira Grogg UW-Madison Sept. 7, 2006 Kira Grogg, UW-Madison

  2. Outline • Finding electrons -- overview of cuts • Δr and energy ratios • Reconstructed electrons • Et, pt, eta, phi • Comparison between reconstructed and generated electrons • Dijet mass and comparison between reconstructed and generated jets • Missing Et Kira Grogg, UW-Madison

  3. Generation of SignalH→WW→eνjj • Signal was generated using Pythia • Higgs mass set to 160 GeV • Forced to decay into two Ws • One W forced to decay into an electron and neutrino, the other into jets Pythia Parameters Kira Grogg, UW-Madison

  4. Electron Selection • Only looking at superclusters with || < 1.5 • Number of events with generated electrons within : 2910 • Basic energy requirements: • Track Pt: 10 GeV < PT < 500 GeV • SuperCluster energy: 10 GeV < Esc,T < 500 GeV (98% remaining) • Exclude jets: • Jets within ∆r < 0.15 of superclusters and ET,jet < 0.15 ET,sc • Events remaining: 2179 (75%) • Require one nearby track • ∆r between SC and tracks: < 0.15 • ET,sc /Track PT > 0.8 • Events remaining: 1962 (67%) Kira Grogg, UW-Madison

  5. r and energy ratio between superclusters and jets Δr must be < 0.15 and sc Et < 85% jet Pt to eliminate a supercluster as an electron Kira Grogg, UW-Madison

  6. r and energy ratio between supercluster and track Δr must be < 0.15 and supercluster Et / track Pt > 0.8 Kira Grogg, UW-Madison

  7. Gen and Reco Electron Et (~67% efficiency) Kira Grogg, UW-Madison

  8. Phi and Eta of Gen and Reco Electrons Kira Grogg, UW-Madison

  9. Comparison of Reco and Gen Electrons Δr for ET of Reconstructed and Generated Electrons -- very close Kira Grogg, UW-Madison

  10. Electron gen v. reco Et and Pt Kira Grogg, UW-Madison

  11. Electron gen v. reco Eta & Phi Kira Grogg, UW-Madison

  12. Gen and Reco DiJet Mass (only jets) Kira Grogg, UW-Madison

  13. Missing Et & Neutrino Et Miss Et from Reco::METCollection Kira Grogg, UW-Madison

  14. Comparison with Backgrounds – Electrons Kira Grogg, UW-Madison

  15. Backgrounds--Dijets Kira Grogg, UW-Madison

  16. Backgrounds – Missing Et Kira Grogg, UW-Madison

  17. Conclusions • Reconstructed electrons match well the energy and location of generated electrons within || < 1.5 • Efficiency ~ 67% • Signal will be hard to identify given the high backgrounds • A reconstructed higgs mass will help • Thanks to A. Nikitenko for providing a configuration file for reconstruction and framework analysis, and to S. Rahatlou for help with EndCap problems. • Additional plots and documentation of procedure can be found at http://www.hep.wisc.edu/~grogg Kira Grogg, UW-Madison

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