dan hertz a examination physics department cornell university 5 4 05 n.
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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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dan hertz a examination physics department cornell university 5 4 05
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
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
how to make a higgs boson and how to lose it
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
let s take a look at that in detail
Let's take a look at that in detail...

Lowest order contributing diagrams

gg  t anti-t H

q anti-qW H

wh l n b anti b
Reconstruction

jet veto

lepton veto

MT(ln) < 100 GeV

WH -> lnb anti-b
  • Trigger
    • lepton, ET miss
    • 2 b jets
t anti t h qq b anti b b anti b l n
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
results almost
Results, almost...

Signal + Background

Pure signal peaks