Abstract
We describe a measurement of the W boson mass mw using 200 pb-1 of √s = 1.96 TeV ppbar collision data from the Fermilab Tevatron collected with the CDF II detector. Using 63,964 W → ev candidates and 51,128 W→ μv candidates, we measure mw = 80413±34(stat)34(syst)MeV/c2. With a total uncertainty of 48 MeV/c2, this represents the single most precise mw measurement to date.
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