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Searching for the Higgs boson at the LHC via H  b anti-b

Dan Hertz A Examination Physics Department Cornell University 5/4/05. Searching for the Higgs boson at the LHC via H  b anti-b. Why are we looking?. Standard Model Higgs mechanism, Electroweak Symmetry-Breaking (EWSB) requires existence of Higgs boson Beyond the SM

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Searching for the Higgs boson at the LHC via H  b anti-b

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  1. Dan Hertz A Examination Physics Department Cornell University 5/4/05 Searching for the Higgs boson at the LHC via Hb anti-b

  2. Why are we looking? • Standard Model • Higgs mechanism, Electroweak Symmetry-Breaking (EWSB) • requires existence of Higgs boson • Beyond the SM • Usually include Higgs, e.g. MSSM • Expected mass range ~130 GeV

  3. The CMS Detector

  4. ATLAS

  5. Cross sections and branching fractions

  6. Decay Modes for the Higgs

  7. Decay modes Light H  g H  b anti-b Heavy H  WW(*) 2l+ETmiss HZZ(*)4l How to make a Higgs boson (and how to lose it) • Direct production • gluon fusion: gg  H • Associated Production • q anti-q  WH • gg,q anti-qt anti-tH • gg, q anti-q  ZH

  8. Let's take a look at that in detail... Lowest order contributing diagrams gg  t anti-t H q anti-qW H

  9. Reconstruction jet veto lepton veto MT(ln) < 100 GeV WH -> lnb anti-b • Trigger • lepton, ET miss • 2 b jets

  10. Reconstruction top W from ln match b jet top W from qq' match b jet Higgs from b-jets. t anti-t H –> qq'b anti-b b anti-b ln • Triggers • lepton, ET miss • at least 6 jets • 4 b jets • 2 non-b jets

  11. You call that a peak?

  12. Results, almost... Signal + Background Pure signal peaks

  13. So do we see something or not? CMS ATLAS

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