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Comprehensive Study of SM Higgs Production and Decay Channels at CMS

Detailed analysis of SM Higgs production and decay processes at CMS, focusing on key kinematic variables and event selections for ttH, ttbb, and ttZ channels. Utilizing advanced techniques to investigate various couplings and optimize signal extraction efficiency.

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Comprehensive Study of SM Higgs Production and Decay Channels at CMS

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  1. ttH(120), H  bb U. of Maryland Shuichi Kunori 15-June-2001 CMS Note 2001/xxx D.Green, K.Maeshima, R.Vidal, W.Wu, S.Kunori

  2. SM Higgs production decay gg fusion WW/ZZ fusion associated associated WH, ZH

  3. 1 iso. lepton (PT>10GeV) 6 jets (4 b tag) (ET>20GeV) -> max. likelihood (b likeliness, W mass, top mass …) Bg: ttbb, ttjj, ttZ0 bb e (%) MH=115 GeV 5 Mass(jj) 30fb-1 Dm/m=3.8% (stat) mistagging probability (%) MH (V.Drollinger)

  4. 1 iso. lepton (e,m) (PT>20GeV) only 2 jets (b-tag) (ET>30GeV) MT(W) -> events in higgs mass window Bg: Wjj, tt, tb bb MH=115 GeV 5 300fb-1

  5. Couplings

  6. ttH CompHEP V41.10 CMGEN CompHEP-PYTHIA interface V46 PYTHIA 6.157 b-tag simulator for pre-selection CMSIM 120 Analysis cone jet finder Final state: t  Wb  lnb t  Wb  jjb H bb 1 isolated lepton MET 6 jets (ET>20GeV) - 4 b-tags

  7. # of Jets (ET>20GeV) ttH ttH w/o em cluster ttbb ttbb w/o em cluster Minimum 5 jets 4 b-tagged

  8. Leading Jets & lepton 100GeV L1 Trigger: 1 lepton + ET(jet)>100GeV HLT b-tag ttH ttbb Offline: only one loosely isolated lepton, i.e. (ETcone-ETlep)/ETcone<0.5 PT>20GeV in |h|<2.5 ttZ 0 200 400 GeV

  9. Mass in ttH sample qq (W) qqb (top) lnb (W) bb (H)

  10. Kinematics VariablesttH (solid) ttbb (dash) M(tbb) q(t-bb) Dy(t-bb) DRy(t-bb) Q*(b-bb) At bb rest system DRh(t-bb)

  11. Dy distributionttH(solid), ttbb(dash), ttZ(dot) |Dy| < 1

  12. Mass(bb)for ttH + ttbb + ttZ Particle level No Dy cut |Dy|<1.0 No Dy cut |Dy|<1.0 CMSIM S/B1/2 ~11.8 (S/B ~1/1) Need good b-tagging !

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