Janice Drohan University College London

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Presentation transcript:

Janice Drohan University College London 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

UK Atlas Higgs Meeting - RHUL - 22 April 2005 ttH, H->bb: Update Generation Status: Signal: Pythia vs Herwig (Jimmy) Very good agreement, slightly more jets in events Problems: Producing large numbers of mc@nlo events. Still to do: Need to produce a ttjj (light jets only) sample Cammin produced this by filtering at Atlfast level Sample Generator # Atlfast AOD Events Restricted decay of tops ttH 120GeV Pythia 300,000 Yes Jimmy 55,000 ttjj 22M No mc@nlo 720,000 qq->ttbb AcerMC 400,000 gg->ttbb 1.8M UK Atlas Higgs Meeting - RHUL - 22 April 2005

UK Atlas Higgs Meeting - RHUL - 22 April 2005 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

UK Atlas Higgs Meeting - RHUL - 22 April 2005 Top Reconstruction MH (MeV) UK Atlas Higgs Meeting - RHUL - 22 April 2005

UK Atlas Higgs Meeting - RHUL - 22 April 2005 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. Dean writing helper function to do this. UK Atlas Higgs Meeting - RHUL - 22 April 2005

UK Atlas Higgs Meeting - RHUL - 22 April 2005 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 mjjb σmjjb mlvb σmlvb mjj σmjj 152.9 10.5 270.2 12.5 105.1 11.4 307.8 17.1 138.5 24.3 65.4 33.5 UK Atlas Higgs Meeting - RHUL - 22 April 2005