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)

2 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

3 Status  Helping to validate D2PD production Venkat slides  Analyzing jet and MET performance using December 2009 data

4 900 GeV w MET-topo  METx and METy

5 900 GeV w MET-topo  MET and SumET

6 900 GeV w MET-topo  Phi

7 2 TeV w MET-topo  METx and METy

8 2 TeV w MET-topo  MET and SumET

9 900 GeV w w Akt4 Jets  Jet n and pt

GeV w Akt4 Jets  Jet eta and dPhi

11 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

12  Continue D2PD validation work Verify top likelihood variables in D2PD

13 Manpower  Faculty Ken Johns  Postdocs Venkat Kaushik plus some fraction of Peter Loch  Students 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