Measurement of thett¯production cross section inpp¯collisions ats=1.96 TeVin the all hadronic decay mode

We report a measurement of the $t\overline{t}$ production cross section using the CDF II detector at the Fermilab Tevatron. The analysis is performed using $311{\mathrm{pb}}^{-1}$ of $p\overline{p}$ collisions at $\sqrt{s}=1.96\mathrm{TeV}$. The data consist of events selected with six or more hadronic jets with additional kinematic requirements. At least one of these jets must be identified as a $b$-quark jet by the reconstruction of a secondary vertex. The cross section is measured to be ${\sigma }_{t\overline{t}}=7.5\pm 2.1(\mathrm{stat}.{)}_{-2.2}^{+3.3}(\mathrm{syst}.{)}_{-0.4}^{+0.5}(\mathrm{lumi}.)\mathrm{pb}$, which is consistent with the standard model prediction.