We present a measurement of the top quark mass and of the
top-antitop pair production cross section using p anti-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-1. 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 +/- 2.4(stat +
JES)+1.2_-1.0(syst) GeV/c2, where the uncertainty from the absolute jet
energy scale is evaluated together with the statistical uncertainty.
The procedure measures also the amount of signal from which we derive a
cross section, sigma_tt-bar ÷.2 +/- 0.5(stat) +/- 1.0(syst) +/- 0.4(lum)
pb, for the measured values of top quark mass and JES.
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Updated: Monday, 2010 April 05 10:05:03 CDT automatically from input from carol picciolo