We present a measurement of the ratio $\frac{\sigma B(W\to e\nu )}{\sigma B(Z^0\to e^{+}{e}^{-})}$ in $\overline{p}p$ collisions at $\sqrt{s}=1.8\mathrm{}$ TeV The data represent an integrated luminosity of 21.7 ${\mathrm{pb}}^{-1\mathrm{}}$ from the 1992-1993 run of the Collider Detector at Fermilab. We find $\frac{\sigma B(W\to e\nu )}{\sigma B(Z^0\to e^{+}{e}^{-})}=10.90\mathrm{}\pm 0.32\left(\mathrm{stat}\right)\pm 0.29\left(\mathrm{syst}\right)$. From this value, we extract a value for the $W$ width, $\Gamma \mathrm{}\left(W\right)=2.064\mathrm{}\pm 0.061\left(\mathrm{stat}\right)\pm 0.059\left(\mathrm{syst}\right)$ GeV, and the branching ratio, $\frac{\Gamma (W\to e\nu )}{\Gamma \mathrm{}\left(W\right)=0.1094\mathrm{}\pm 0.0033\left(\mathrm{stat}\right)\pm 0.0031\left(\mathrm{syst}\right)}$, and we set a decay-mode-independent limit on the top quark mass $m_{\mathrm{top}}>62\mathrm{}$ GeV/${\mathit{c}}^2$ at the 95% C.L.

• Received 3 March 1994

DOI:https://doi.org/10.1103/PhysRevLett.73.220