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