Measurement of theWboson mass

We present a measurement of the W boson mass using data collected by the D0 experiment at the Fermilab Tevatron during 1994–1995. We identify W bosons by their decays to $e\nu$ final states. We extract the W mass $M_W$ by fitting the transverse mass and transverse electron momentum spectra from a sample of 28 323 $\overrightarrow{W}e\nu$ decay candidates. We use a sample of 3563 dielectron events, mostly due to $\overrightarrow{Z}\mathrm{ee}$ decays, to constrain our model of the detector response. From the transverse mass fit we measure $M_W=80.44\pm 0.10\left(\mathrm{stat}\right)\mathrm{}\pm 0.07\left(\mathrm{syst}\right)\mathrm{}\mathrm{}$ GeV. Combining this with our previously published result from data taken in 1992–1993, we obtain $M_W=80.43\mathrm{}\pm 0.11\mathrm{GeV}.$