tth h bb update
Download
Skip this Video
Download Presentation
ttH, H->bb: Update

Loading in 2 Seconds...

play fullscreen
1 / 6

ttH, H->bb: Update - PowerPoint PPT Presentation


  • 133 Views
  • Uploaded on

ttH, H->bb: Update. Janice Drohan University College London. Overview: Atlfast Samples Top reconstruction: Χ 2 vs Δ 2. ttH, H->bb: Update. Generation Status: Signal: Pythia vs Herwig (Jimmy) Very good agreement, slightly more jets in events Problems:

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' ttH, H->bb: Update' - guido


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
tth h bb update

ttH, H->bb: Update

Janice Drohan

University College London

  • Overview:
  • Atlfast Samples
  • Top reconstruction: Χ2 vs Δ2

UK Atlas Higgs Meeting - RHUL - 22 April 2005

tth h bb update1
ttH, H->bb: Update
  • Generation Status:
  • Signal: Pythia vs Herwig (Jimmy)
    • Very good agreement, slightly more jets in events
  • Problems:
  • Still to do:
    • Need to produce a ttjj (light jets only) sample
      • Cammin produced this by filtering at Atlfast level

UK Atlas Higgs Meeting - RHUL - 22 April 2005

top reconstruction
Top Reconstruction
  • TDR Method:
    • Minimises: Δ2=(mlvb-mt)2+(mjjb-mt)2
    • Correct Jets assigned to Higgs ~25% cases
    • Started looking at 2nd lowest Δ2 value:
  • Produces correct Higgs in a similar number of cases

MH (MeV)

UK Atlas Higgs Meeting - RHUL - 22 April 2005

top reconstruction1
Top Reconstruction

MH (MeV)

UK Atlas Higgs Meeting - RHUL - 22 April 2005

top reconstruction2
Top Reconstruction
  • Trying to use instead of Δ2:
  • Using errors from within Atlfast Code for Jet energies and electron energy:

Jet:e:eta<1.4

  • Don’t yet have muon energy error
    • S. Deanwriting helper function to do this.

UK Atlas Higgs Meeting - RHUL - 22 April 2005

top reconstruction3
Top Reconstruction
  • Errors looking reasonable:
  • Plans:
    • Look into performance of χ2
    • Assigning of b-jets to Higgs in case of 3 left
      • 138 events out of 2155, 60 wrong combinations when choosing jets with highest pT
    • ANN for signal/background separation

UK Atlas Higgs Meeting - RHUL - 22 April 2005

ad