Measurement of the Top Quark Pair Production Cross Section in the All-Jets Decay Channel

We present a measurement of $t\overline{t}$ production in $p\overline{p}$ collisions at $\sqrt{s}=1.8\mathrm{}\mathrm{TeV}$ from $110{\mathrm{pb}}^{-1\mathrm{}}$ of data collected in the all-jets decay channel with the D0 detector at Fermilab. A neural network analysis yields a cross section of $7.1\pm 2.8\left(\mathrm{stat}\right)\pm 1.5\left(\mathrm{syst}\right)\mathrm{pb}$ at a top quark mass $\left(m_t\right)$ of $172.1\mathrm{GeV}{/c}^2$. Using previous D0 measurements from dilepton and single lepton channels, the combined D0 result for the $t\overline{t}$ production cross section is $5.9\pm 1.2\left(\mathrm{stat}\right)\pm 1.1\left(\mathrm{syst}\right)\mathrm{pb}$ for $m_t=172.1\mathrm{GeV}{/c}^2$.