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Status and Plans for the Measurement of the Top Quark Production Cross Section in the
Leptons plus Jets Channel
Ken Johns, Venkat Kaushik, Xiaowen Lei
(U. Arizona)
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Status
Developed an ARA based framework for analyzing ESD, AOD, D2PD OR D3PD Add some details
Used 10 TeV Data and Monte Carlo samples to estimate the uncertainty of the top quark cross section using a top likelihood method Participated in top group event by event
validation excercises Show a few results from Xiaowen Streamlined machinery for calculating and
fitting mock data with top likelihood
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Status
Helping to validate D2PD production Venkat slides
Analyzing jet and MET performance using December 2009 data
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900 GeV w MET-topo
METx and METy
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900 GeV w MET-topo
MET and SumET
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900 GeV w MET-topo
Phi
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2 TeV w MET-topo
METx and METy
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2 TeV w MET-topo
MET and SumET
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900 GeV w w Akt4 Jets
Jet n and pt
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900 GeV w Akt4 Jets
Jet eta and dPhi
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Plans
Optimize top likelihood for 7 TeV data Monte Carlo samples not yet available Variable optimization in progress including
bjet tagging Machinery for QCD background estimate
being built
Begin searching for a top signal from Day 1 Data samples will be small so ARA can be
used before D2PD and D3PD samples are assembled
Continue studies of jet and MET performance
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Continue D2PD validation work Verify top likelihood variables in D2PD
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Manpower
Faculty Ken Johns
Postdocs Venkat Kaushik plus some fraction of
Peter LochStudents
Xiaowen Lei Graduating 12/10? Monte Carlo thesis
using 7 TeV samples plus jet/MET performance studies using 7 TeV data
Finn O’Grady 1’st year student