Measurement of the W boson mass with the Collider Detector at Fermilab

We present a measurement of the W boson mass using data collected with the CDF detector during the 1994-1995 collider run at the Fermilab Tevatron. A fit to the transverse mass spectrum of a sample of 30115 W-->eν events recorded in an integrated luminosity of 84 pb^-1 gives a mass M_W=80.473+/-0.065(stat)+/-0.092(syst) GeV/c². A fit to the transverse mass spectrum of a sample of 14740 W-->μν events from 80 pb^-1 gives a mass M_W=80.465+/-0.100(stat)+/-0.103(syst) GeV/c². The dominant contributions to the sys- tematic uncertainties are the uncertainties in the electron energy scale and the muon momentum scale, 0.075 GeV/c² and 0.085 GeV/c², respectively. The combined value for the electron and muon channel is M_W=80.470+/-0.089 GeV/c². When combined with previously published CDF measurements, we obtain M_W=80.433+/-0.079 GeV/c².