Direct measurement of the W boson decay width

Based on 85 ${\mathrm{pb}}^{\mathrm{-}1}$ data of $p\overline{p}$ collisions at $\sqrt{s}=1.8\mathrm{}\mathrm{TeV}$ collected using the DØ detector at Fermilab during the 1994–1995 run of the Tevatron, we present a direct measurement of the total decay width of the W boson ${\Gamma }_W.$ The width is determined from the transverse mass spectrum in the $\overrightarrow{W}e+{\nu }_e$ decay channel and found to be ${\Gamma }_W{=2.23\mathrm{}}_{-0.14}^{+0.15\mathrm{}}\left(\mathrm{stat}\right)\pm 0.10\left(\mathrm{syst}\right)\mathrm{GeV},$ consistent with the expectation from the standard model.