We present the measurement of the top quark pair production cross
section in p anti-p collisions at s**(1/2) = 1.96 TeV using 318 pb-1 of data
collected by the CDF detector at the Fermilab Tevatron. We measure the
cross section in events with one high transverse momentum electron or muon,
large missing transverse energy and three or more jets, where at least one
bottom quarks from the top quark decay is identified via a secondary vertex
tagging algorithm. The measured tt-bar cross section is
8.7+0.9_-0.9(stat)+1.2_-0.9(syst) pb, assuming a top quark mass of 178
GeV. The cross section measurement in the subsample in which both b-quark
jets are identified gives 10.1+1.6_-1.4(syst) pb. We present one
additional measurement of the tt-bar cross section in the same dataset but
without the b-tagging requirement. Top quark events are distinguished from
the primary background of W boson production with associated jets using an
artificial neural network method with a variety of kinematic quantities.
This measurement uses a larger dataset albeit with a smaller tt-bar
fraction. The tt-bar cross section without b-tagging is measured to be 6.0
+/- 0.8(stat) +/- 1.0(syst) pb.
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Updated: Wednesday, 2006 February 15 10:18:09 CST automatically from input from Carol Picciolo