We report a measurement of the tt-bar production cross section
using the CDF II detector at the Fermilab Tevatron. The data consist of
events with an energetic electron or muon, missing transverse energy, and
three or more hadronic jets, at least one of which is identified as a
b-quark jet by reconstructing a secondary vertex. The background fraction
is determined from a fit of the transverse energy of the leading jet. Using
162 +/- 10 pb^-1 of data, the total cross section is found to be 6.0 +/-
1.6(stat) +/- 1.2 (syst.) pb, which is consistent with the Standard Model
prediction.
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Updated: Thursday, 2005 April 14 11:17:47 CDT automatically from input from Carol Picciolo