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


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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



Public webpage with Winter 2004 Blessed Plots and Tables

Link to the kinematic Ht x-sec analysis.

195/pb Pre-Blessing talk: 03/04/04 Radu Marginean ps

Questions from Full Status Report, Pre-Blessing and Blessing

CDF Note 6897 last updated 8/26/04



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.

Final Fits to the NN-output shape :

Fits for a 195^{-1} pb data sample follow bellow.  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.  Apriori, our primary result is for the 3 or more jet bin.

W + 3 or More Jet Sample

W + 4 or More Jet Sample


Fit to the NN-output shape for at least 3 jets, showing shapes of contributing components (EPS)

Fit to the NN-output shape for at least 4 jets, showing shapes of contributing components (EPS)

Predicted NN output shape for at least 3 jets, showing stacked contribution of each component (EPS)

Predicted NN output shape for at least 4 jets, showing stacked contribution of each component (EPS)


Last modified on 03/14/05 by Radu Marginean