Dan hertz a examination physics department cornell university 5 4 05
This presentation is the property of its rightful owner.
Sponsored Links
1 / 13

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


  • 50 Views
  • Uploaded on
  • Presentation posted in: General

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

Download Presentation

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

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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


Searching for the higgs boson at the lhc via h b anti b

The CMS Detector


Atlas

ATLAS


Cross sections and branching fractions

Cross sections and branching fractions


Decay modes for the higgs

Decay Modes for the Higgs


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


You call that a peak

You call that a peak?


Results almost

Results, almost...

Signal + Background

Pure signal peaks


So do we see something or not

So do we see something or not?

CMS

ATLAS


  • Login