Measurement of the Top Quark Mass with the Collider Detector at Fermilab

Abstract

We present a new measurement of the top quark mass in $t\overline{t}$ events in which both $W$ bosons from top quarks decay into leptons $(e\ensuremath{\nu},\ensuremath{\mu}\ensuremath{\nu})$. We use events collected by the CDF experiment from $p\overline{p}$ collisions at $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8\mathrm{TeV}$ at the Tevatron collider. We measure a top quark mass of $167.4\ifmmode\pm\else\textpm\fi{}10.3(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}4.8(\mathrm{syst})\phantom{\rule{0ex}{0ex}}\mathrm{GeV}{/c}^{2}$ from a sample of eight events. We combine this result with previous CDF measurements in other decay channels to obtain a final mass value of $176.0\ifmmode\pm\else\textpm\fi{}6.5\mathrm{GeV}{/c}^{2}$.