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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:

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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:

    • Producing large numbers of [email protected] events.

  • 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


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