We present a measurement of the tt-bar production cross section
using 194 pb-1 of CDF II data using events with a high transverse momentum
electron or muon, three or more jets, and missing transverse energy. The
measurement assumes 100% t --> Wb branching fraction. Events consistent with
tt-bar decay are found by identifying jets containing heavy flavor
semileptonic decays to muons. The dominant backgrounds are evaluated
directly from the data. Based on 20 candidate events and an expected
background of 9.5 +/- 1.1 events, we measure a production cross section of
5.3 +/- 3.3+1.3_-1.0 pb, in agreement with the standard model.
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Updated: Wednesday, 2005 September 07 15:51:50 CDT automatically from input from Carol Picciolo