A measurement of the mass of the $W$ boson is presented based on a sample of 5982 $W\to e\nu$ decays observed in $p\overline{p}$ collisions at $\sqrt{s}=1.8\mathrm{}\mathrm{TeV}$ with the D0 detector during the 1992–1993 run. From a fit to the transverse mass spectrum, combined with measurements of the $Z$ boson mass, the $W$ boson mass is measured to be $M_W=80.350\mathrm{}\pm 0.140\left(\mathrm{stat}\right)\pm 0.165\left(\mathrm{syst}\right)\pm 0.160\left(\mathrm{scale}\right)\mathrm{GeV}/c^2$.

• Received 11 July 1996

DOI:https://doi.org/10.1103/PhysRevLett.77.3309