Measurement of the ratio σB(pp¯→W→eν)/σB(pp¯→ Z0 →ee) inpp¯collisions at √s=1800 GeV

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We present an analysis of data from p p\ifmmode\bar\else\textasciimacron\fi{} collisions at a center-of-mass energy of \ensuremath{\surd}s =1800 GeV. A measurement is made of the ratio R\ensuremath{\equiv}\ensuremath{\sigma}B(p p\ifmmode\bar\else\textasciimacron\fi{}\ensuremath{\rightarrow}W\ensuremath{\rightarrow}e\ensuremath{\nu})/\ensuremath{\sigma}B(p p\ifmmode\bar\else\textasciimacron\fi{}\ensuremath{\rightarrow}${\mathit{Z}}^{0}$\ensuremath{\rightarrow}ee). The data represent 19.6 ${\mathrm{pg}}^{\mathrm{\ensuremath{-}}1}$ collected by the Collider Detector at Fermilab during the 1992--1993 collider run of the Fermilab Tevatron. We find R=10.90\ifmmode\pm\else\textpm\fi{}0.32(stat)\ifmmode\pm\else\textpm\fi{}0.29(syst), and from this value we extract a measurement of the W\ensuremath{\rightarrow}e\ensuremath{\nu} branching ratio \ensuremath{\Gamma}(W\ensuremath{\rightarrow}e\ensuremath{\nu})/\ensuremath{\Gamma}(W)=0.1094\ifmmode\pm\else\textpm\fi{}0.0033(stat)\ifmmode\pm\else\textpm\fi{}0.0031(syst). From this branching ratio we set a limit on the top quark mass of ${\mathit{m}}_{\mathit{t}}$>62 GeV/${\mathit{c}}^{2}$ at the 95% confidence level. In contrast with direct searches for the top quark, this limit makes no assumptions about the allowed decay modes of the top quark. In addition, we use a calculation of the leptonic width \ensuremath{\Gamma}(W\ensuremath{\rightarrow}e\ensuremath{\nu}) to obtain a value for the W total decay width: \ensuremath{\Gamma}(W)=2.064\ifmmode\pm\else\textpm\fi{}0.060(stat)\ifmmode\pm\else\textpm\fi{}0.059(syst) GeV.

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