Measurement of the top quark mass andpp¯→tt¯cross section in the all-hadronic mode with the CDF II detector

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Abstract

We present a measurement of the top quark mass and of the top-antitop ($t\overline{t}$) pair production cross section using $p\overline{p}$ data collected with the CDF II detector at the Tevatron Collider at the Fermi National Accelerator Laboratory and corresponding to an integrated luminosity of $2.9\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. 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 $174.8\ifmmode\pm\else\textpm\fi{}2.4(\mathrm{stat}+\mathrm{JES}{)}_{\ensuremath{-}1.0}^{+1.2}(\mathrm{syst})\text{ }\text{ }\mathrm{GeV}/{c}^{2}$, 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, ${\ensuremath{\sigma}}_{t\overline{t}}=7.2\ifmmode\pm\else\textpm\fi{}0.5(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}1.0(\mathrm{syst})\ifmmode\pm\else\textpm\fi{}0.4(\mathrm{lum})\text{ }\text{ }\mathrm{pb}$, for the measured values of top quark mass and JES.

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