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Tag Jets in Vector Boson Fusion

Tag Jets in Vector Boson Fusion. Bruce Mellado University of Wisconsin-Madison HERA and LHC Workshop, 27/03/04. VBF. gg  H. Associated. SM Higgs at LHC. Production: Direct gg  H Dominant Large background at masses close to LEP limit qq qqH (VBF) Distinct final state Associated

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Tag Jets in Vector Boson Fusion

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  1. Tag Jets in Vector Boson Fusion Bruce Mellado University of Wisconsin-Madison HERA and LHC Workshop, 27/03/04

  2. VBF gg  H Associated SM Higgs at LHC • Production: • Direct • gg  H • Dominant • Large background at masses close to LEP limit • qq qqH (VBF) • Distinct final state • Associated • ttH, WH, ZH • Small cross-section Bruce Mellado, HERA-LHC Workshop, 27/03/04

  3. Jet Jet Forward jets f h Higgs Decay Low Mass Higgs via VBF • Wisconsin Phenomenology Institute (D.Rainwater, D.Zeppenfeld et al.): • Two high PT jets with large Dhseparation • Strong discovery potential for low Higgs mass • Helps measuring couplings • Invisible Higgs decays • Feasibility studies • CMS Note 2003/033 • ATLAS SN-ATLAS-2003-024 • Updates in progress Bruce Mellado, HERA-LHC Workshop, 27/03/04

  4. High Lumi Central Forward Low Lumi Major Experimental Issues • Major experimental issues addressed with a full detector simulation (Geant3) • Tagging forward jets: • Efficiencies critical • Full simulation used • Double tag efficiency ~50% • Central jet veto: • Pile up effects introduce fake central jets • Effect small at low luminosity • Serious concern at high luminosity • Very sensitive to underlying effect • Detailed studies underway Bruce Mellado, HERA-LHC Workshop, 27/03/04

  5. Low Mass Higgs via VBF • H->WW*->ll,lqq. Strongest in 125<MH<190 GeV • Main background: • tt EW WWjj • W + 4 jets • H->->ll,lh (+ptmiss). Strong around LEP limit • Main background • QCD and EW Zjj • H->. Contributes around LEP limit • Main background • Real and fake non-resonant  Bruce Mellado, HERA-LHC Workshop, 27/03/04

  6. Intermediate Mass Higgs via VBF • Used for first time HWWll and HZZllqq associated with two hard jets for intermediate masses (2MZ<MH<500 GeV) • By using kinematic fits obtain (M/M2.5%) with HZZllqq • Discovery confirmation and direct measurement of couplings ratio ATLAS Preliminary Bruce Mellado, HERA-LHC Workshop, 27/03/04

  7. Sensitivity to low mass SM Higgs dominated by VBF • VBF studies extended to intermediate masses ATLAS Preliminary Bruce Mellado, HERA-LHC Workshop, 27/03/04

  8. MSSM Higgs Discovery Potential One Experiment 10 fb-1 (With VBF) Two Experiments 10 fb-1 (No VBF) Bruce Mellado, HERA-LHC Workshop, 27/03/04

  9. Summary • Searches associated with two hard jets dominate sensitivity for low mass Higgs • With Neural nets and likelihood techniques may reach 5 effect for MH>115 GeV with one experiment and 10 fb-1 assuming expected detector performance • ATLAS has extended these searches to 2MZ<MH<500 GeV • With these searches one experiment may cover all MSSM parameter space with 10 fb-1 • Forward jet tagging efficiency crucial and understanding of central jet veto - crucial issues • Sensitive to underlying event. Studies with a full detector simulation underway Bruce Mellado, HERA-LHC Workshop, 27/03/04

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