We present a measurement of the top quark pair production
cross section in p anti-p collisions at s**(1/2) ñ.96 TeV using a data
sample corresponding to 1.7 fb-1 of integrated luminosity collected
with the Collider Detector at Fermilab. We reconstruct tt-bar events
in the lepton-jets channel, consisting of e nu + jets and mu nu + jets
final states. The dominant background is the production of W bosons in
association with multiple jets. To suppress this background, we identify
electrons from the events, we obtain 120 tagged events with a background
expectation of 51 +/- 3 events, corresponding to a cross section of
sigma_tt ÷.8 +/- 2.4 (stat) +/- 1.6 (syst) +/- 0.5 (lumi) pb. We assume
a top-quark mass of 175 GeV/c2. This is the first measurement of the
tt-bar cross section with soft electron tags in Run II of the Tevatron.
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Updated: Wednesday, 2010 May 19 13:16:29 CDT automatically from input from carol picciolo