We present a measurement of the W boson mass using data collected
with the CDF detector during the 1994-95 collider run at the Fermilab
Tevatron. A fit to the transverse mass spectrum of a sample of 30,115 w ->
e nu events recorded in an integrated luminosity of 84 pb-1 gives a mass
M_W = 80.465 +/- 0.065(stat.) +/- 0.092(syst.) GeV/c2. A fit to the
transverse mass spectrum of a sample of 14,740 W --> mu nu 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 systematic 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.
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Updated: Wednesday, 2001 August 29 10:52:05 CDT automatically from input from Carol Picciolo