Measurement of the t(t)over-bar production cross section in p(p)over-bar collisions at root s=1.96 TeV using soft electron b-tagging

Measurement of the t(t)over-bar production cross section in p(p)over-bar collisions at root s=1.96 TeV using soft electron b-tagging Measurement of the top quark mass and p p ! t t cross section in the all-hadronic mode with the CDF II detector We present a measurement of the top quark mass and of the top-antitop (t " t) pair production cross section using p " p data collected with the CDF II detector at the Tevatron Collider at the Fermi National Accelerator Laboratory and corresponding to an integrated luminosity of 2:9 fb À1. We select events with six or more jets satisfying a number of kinematical requirements imposed by means of a neural-network algorithm. At least one of these jets must originate from a b quark, as identified by the reconstruction of a secondary vertex inside the jet. The mass measurement is based on a likelihood fit incorporating reconstructed mass distributions representative of signal and background, where the absolute jet energy scale (JES) is measured simultaneously with the top quark mass. The measurement yields a value of 174:8 AE 2:4ðstat þ JESÞ þ1:2 À1:0 ðsystÞ GeV=c 2 , where the uncertainty from the absolute jet energy scale is evaluated together with the statistical uncertainty. The procedure also measures the amount of signal from which we derive a cross section, t" t ¼ 7:2 AE 0:5ðstatÞ AE 1:0ðsystÞ AE 0:4ðlumÞ pb, for the measured values of top quark mass and JES.