Abstract
We investigate the event topology of the $l\ensuremath{\nu}b\overline{b}q\mathrm{q\ifmmode\bar\else\textasciimacron\fi{}}$ decay mode of top-quark-pair production in proton-antiproton collisions at 1.8 TeV. Neural networks and Fisher discriminates are used in conjunction with modified Fox-Wolfram ``shape'' variables to help distinguish the top-quark-pair signal from the $W+\mathrm{jets}$ and $b\overline{b}+\mathrm{jets}$ background. Instead of requiring at least four jets in the event, we employ a cut on the number of calorimeter cells with a transverse energy greater than some minimum. By combining these cell cuts with the event shape information, we are able to obtain a signal-to-background ratio of around 9 (for an ideal detector), without tagging $b$ quarks. $B$-quark tagging would, of course, further enhance the signal-to-background ratio.
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