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Arguments for a “low mass” Higgs

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Low Mass Higgs @ LHC Why low mass? Production characteristics Decay characteristics Overview of search strategies or who does what and how does it hang together. Arguments for a “low mass” Higgs. 114 < m h < 200 @95%CL in SM LEP saw enhancement at 115 GeV. SUSY favors m h <135GeV.

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Low Mass Higgs @ LHCWhy low mass?Production characteristicsDecay characteristicsOverview of search strategiesorwho does what and how does it hang together

arguments for a low mass higgs
Arguments for a “low mass” Higgs
  • 114 < mh < 200 @95%CL in SM
  • LEP saw enhancement at 115 GeV.
  • SUSY favors mh<135GeV
sm higgs at lhc 10 40pb

NLO Cross sections

M. Spira et al.

gg fusion

IVB fusion

SM Higgs at LHC: ~10-40pb
other sm physics xsections crude guestimates
Other SM Physics Xsections(crude guestimates)
  • Total Xsection = 1011pb
  • b-quark pT>30GeV = 106pb
  • W-> e/mu nu = 5x104pb
  • Top-quark = 860pb

=> Always gives WW

  • WW from QCD = 100pb
  • Higgs = 10pb
cms l1 trigger
CMS L1 Trigger
  • Di-electron/photon
  • Di-muon

=> Only di-photon, WW, and ZZ decays matter

w z and tau decays
W,Z, and tau decays
  • W:
    • 10% to lepton & neutrino for each e,mu,tau
    • 70% to di-jet
  • Z:
    • 3.4% each ee, mu mu, tau tau
    • 20% for di-neutrino
    • 70% for di-jet
  • Tau:
    • 35% for e or mu plus 2 neutrinos
    • 50% for other “1-prong”
some di boson br s ll ee or mumu tt tau tau two isolated tracks jj di jet
Some di-boson BR’sll = ee or mumutt = tau tau = two isolated tracksjj = di-jet
  • BR(WW -> lnu lnu) = 4x1% = 4%
  • BR(ZZ -> llll) = 4x0.1 % = 0.4%
  • BR(ZZ -> lltt) = 4x0.08% = 0.3%
  • BR(ZZ -> llnunu) = 2x0.7% = 1.4%
  • BR(ZZ -> lljj) = 2x2.4% = 4.8%
higgs search strategies
Higgs Search Strategies
  • 2 leptons & missing ET
    • Shih-Chieh’s thesis at CDF
    • Covers 3% of total BR(H->llnunu)
  • Di-lepton & di-jet
    • Matthew @ CDF for mH = 150GeV sweatspot
    • Covers 2.4% x 8% = 0.2%
  • Traditional 4 leptons
    • Covers 0.4% x 8% = 0.03% @ 150GeV sweatspot
    • ll track track may double this if we’re lucky ?
    • Kevin @ CDF in WZ mostly
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