T-tbar  6jets quick look at Optimal Jet Finder jets Physics and Astronomy University of Victoria British Columbia, Canada LAPP, 28 Feb 2007 Michel Lefebvre.

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Presentation transcript:

t-tbar  6jets quick look at Optimal Jet Finder jets Physics and Astronomy University of Victoria British Columbia, Canada LAPP, 28 Feb 2007 Michel Lefebvre

Michel Lefebvre, 2007/02/28ttbar -> 6 jets and OJF2 Samples Generated by Damir Sample 5204  ttbar  6jets, full simulation, Athena AOD produced using Athena  1050 events, E T > 7 GeV filter on jets  ParticleJetContainer each produced which its own H1 weights –Cone4TowerParticleJetsCone4TopoParticleJets –ConeTowerParticleJetsConeTopoParticleJets –Kt4TowerParticleJetsKt4TopoParticleJets –Kt6TowerParticleJetsKt6TopoParticleJets  JetCollection using OJF no proper H1 weights available: use Cone weights number of jets fixed to 6 R parameter set to 0.7 –FuzzyTowerJetsFuzzyClusterJets

Michel Lefebvre, 2007/02/28ttbar -> 6 jets and OJF3 Jet-parton matching Study events with “true” jet hypothesis Matching criteria  For each parton, look for a matching jet restrict search in a region limited by  R max = 0.2 keep the closest jet in this region  Demand that a jet be matched only once matching efficiencies depends on interparton distances –same top combinations  R(u-b)  = ±  R(ubar-bbar)  = ±  R(u-dbar)  = ±  R(ubar-d)  = ±  R(dbar-b)  = ±  R(d-bbar)  = ± –other 9 combinations  R   2.40

Michel Lefebvre, 2007/02/28ttbar -> 6 jets and OJF4 Parton matching efficiencies no p T jet cuts applied

Michel Lefebvre, 2007/02/28ttbar -> 6 jets and OJF5 Normalized distributions: towers

Michel Lefebvre, 2007/02/28ttbar -> 6 jets and OJF6 Normalized distributions: topo clusters

Michel Lefebvre, 2007/02/28ttbar -> 6 jets and OJF7 Normalized p T distributions: towers

Michel Lefebvre, 2007/02/28ttbar -> 6 jets and OJF8 Normalized E distributions: towers

Michel Lefebvre, 2007/02/28ttbar -> 6 jets and OJF9 Normalized p T distributions: topo clusters

Michel Lefebvre, 2007/02/28ttbar -> 6 jets and OJF10 Normalized E distributions: topo clusters

Michel Lefebvre, 2007/02/28ttbar -> 6 jets and OJF11 Comments Very encouraging results for OFJ  here fixed number of jet mode!  should try with number of jets not fixed adjust  parameter  more events would allow mass plots requires 6 matched partons 1 to 1