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Higgs Physics with ATLAS

Higgs Physics with ATLAS. Arno Straessner Journée de réflexion du DPNC 14 septembre 2007. Δχ 2. M H /GeV. 60 Secs Commercial Break. theory. experiment. λ H. V( Φ H ). ...soon at the LHC. Light. Standard Model Higgs - Production and Decay. the easiest: H →ZZ →4ℓ

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Higgs Physics with ATLAS

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  1. Higgs Physics with ATLAS Arno Straessner Journée de réflexion du DPNC 14 septembre 2007

  2. Δχ2 MH/GeV 60 Secs Commercial Break theory experiment λH V(ΦH) ...soon at the LHC Light

  3. Standard Model Higgs - Production and Decay

  4. the easiest: H→ZZ →4ℓ the low-mass signal: H→γγ Search Channels four high pT leptons and Z mass constraint 1% mass resolution 10 fb-1 background from sidebands

  5. in the most promising mass range: VBF qq → V*V*qq → Hqq → WWqq / ττqq Search Channels 1 fb-1 1 fb-1 forward jet tagging central jet veto → reduced background 30 fb-1 10% mass resolution

  6. SM Higgs Mass Reach at LHC most interesting mass range → many channels to combine! careful with NLO corrections to gg→H → reduced significance

  7. background and reconstruction studies → discovery! Strategy for First Data

  8. in SM: Higgs is 0++ measure spin and CP in H decay easiest in H→ZZ →4ℓ Higgs Spin and CP mass of off-shell Z

  9. ZZ decay plane correlations for 100 fb-1 with complete detector simulation Higgs Spin and CP decay plane angle + fermion angle in Z rest frame CP- CP+

  10. measurement of H→ZZ couplings spin-0 case: Higgs Spin and CP Re(C) SM CP- CP+ A

  11. quick overview of SM Higgs search 5 sigma significance possible with 10 fb-1 over wide mass range (MH>130 GeV) low mass region needs more luminosity: ~ factor 2-3 spin and CP structure can be determined in H→ZZ (and also in VBF) some more data will be needed in the meantime: try to prepare analysis as realistic as possible refine search methods new statistical procedures (beyond LEP) we will find the Higgs – if it’s there... Summary and Outlook

  12. possible in VBF Higgs Spin and CP Spin 0 CP +1 non-SM coupling in ZZ →H Δφof tag jets

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