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1.1     ! uid12904    1: This note presents a new measurement of $p\bar p \to t \bar tX$ production 
        !             2: at $\sqrt{s}=1.96$ TeV using 4951.86 pb$^{-1}$ of data collected with the
        !             3: D\O\ detector between 2002 and 2010. We focus on the final state
        !             4: where the $W$ boson from one of the top quarks decays into a 
        !             5: $\tau$ lepton and its associated neutrino, while the other W boson decays into 
        !             6: a quark-antiquark pair. We aim to select those events in which the
        !             7: $\tau$ lepton subsequently decays hadronically, meaning to one or three charged hadrons, zero
        !             8: or more neutral hadrons and a tau neutrino. We use a neural network b-tagging algorithm
        !             9: as well as a topological neural network to enhance signal over the background. For a top quark
        !            10: mass of 172.5 GeV the preliminary result for the measured cross section is:
        !            11: 
        !            12: \begin{center}\[\sigma (t\overline{t}) = 
        !            13: 8.46\;\;_{-1.04}^{+1.06}\;\;({\textrm{stat}})\;\;_{-0.88}^{+0.92}\;\;({\textrm{syst}})\;\;\pm 0.3\;\;({\textrm{lumi}})\;\; \rm{pb.}\]
        !            14: \par\end{center}
        !            15: