Measurement of the ttbar Cross Section in the Lepton + Jets Channel Using Event Kinematics


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R. Hughes, R. Marginean, E. Thomson, B. Winer
The Ohio State University
R. Erbacher, R. Roser
Fermi National Accelerator Laboratory

J. Conway
 Rutgers University

New results for winter 2004 conferences with 195/pb


Public webpage with 195/pb Plots and Tables

NEW! Link to Kinematic analysis using NN

195/pb HT CDF note last updated 8/26/04

195/pb HT Blessing talk 01/29/04 Robin Erbacher pdf and ppt

195/pb HT Questions from Preblessing and afterwards

195/pb HT Pre-blessing talk 12/18/03 Evelyn Thomson pdf and ppt

195/pb HT Full Status Report 12/11/03 Robin Erbacher pdf and ppt

Blessed result for summer 2003 conferences with 126/pb


Main Link to All Summer 2003 Blessed Plots and Tables

126/pb HT CDF Note 6206 last updated 08/07/03

Answers to questions asked during 126/pb HT blessing process

126/pb HT Blessing talk 08/07/03 Robin Erbacher pdf and ppt

126/pb HT Pre-blessing talk 07/24/03 Richard Hughes pdf and ppt


Final Results for 195/pb:


Table showing number of events in data, ttbar fraction, and resulting cross section with statistical errors listed first, systematic errors listed second.  (EPS)


Final HT Fits to the Signal Region:

Our fits to the signal region follow below.  The W-like shapes include the contribution from W+3p, Wbbar+1p, Z->ll (3 flavors), W->tau nu+2p, WW+1p, WZ, single top.  Electrons and muons have been combined for the fits.  The QCD shape is taken from the non-isolated leptons and fixed to 6.3% from our MET v. Isolation calculations.  The ttbar and W-like shapes float in the fits.  Our primary result is using Ht and our a priori selection is the result for the 3 or more jet bin.

W + 3 or More Jet Sample

W + 4 or More Jet Sample

Fit to Ht for at least 3 jets, showing stacked contribution of each component (EPS) (TIF)

Fit to Ht for at least 4 jets, showing stacked contribution of each component (EPS) (TIF)

Last modified on 03/14/05 by Radu Marginean