Search for High Mass Top Quark Production in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">p</mml:mi><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>p</mml:mi></mml:mrow><mml:mrow><mml:mi>¯</mml:mi></mml:mrow></mml:mover></mml:mrow></mml:mrow></mml:math>Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:mrow><mml:mi mathvariant="italic">s</mml:mi></mml:mrow></mml:msqrt><mml:mspace/><mml:mo>=</mml:mo><mml:mspace/></mml:math>1.8 TeV

Abstract

We present new results on the search for the top quark in $p\overline{p}$ collisions at $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8$ TeV with an integrated luminosity of $13.5\ifmmode\pm\else\textpm\fi{}1.6$ p${\mathrm{b}}^{--1}$. We have considered $t\overline{t}$ production in the standard model using electron and muon dilepton decay channels ( $t\overline{t}\ensuremath{\rightarrow}e\ensuremath{\mu}+$ jets, $\mathrm{ee}+$ jets, and $\ensuremath{\mu}\ensuremath{\mu}+$ jets) and single-lepton decay channels ( $t\overline{t}\ensuremath{\rightarrow}e+$ jets and $\ensuremath{\mu}+$ jets) with and without tagging of $b$ quark jets. From all channels we have nine events with an expected background of $3.8\ifmmode\pm\else\textpm\fi{}0.9$. If we assume that the excess is due to $t\overline{t}$ production, and assume a top mass of 180 GeV/ ${c}^{2}$, we obtain a cross section of $8.2\ifmmode\pm\else\textpm\fi{}5.1$ pb.