Measurement of the cross section fortt¯production inpp¯collisions using the kinematics of lepton+jets events

We present a measurement of the top pair production cross section in $p\overline{p}$ collisions at $\sqrt{s}=1.96\mathrm{TeV}$. We collect a data sample with an integrated luminosity of $194\pm 11{\mathrm{pb}}^{-1}$ with the CDF II detector at the Fermilab Tevatron. We use an artificial neural network technique to discriminate between top pair production and background processes in a sample of 519 lepton+jets events, which have one isolated energetic charged lepton, large missing transverse energy and at least three energetic jets. We measure the top pair production cross section to be ${\sigma }_{t\overline{t}}=6.6\pm 1.1\pm 1.5\mathrm{pb}$, where the first uncertainty is statistical and the second is systematic.