We have measured the W-boson mass MW using data corresponding to 2.2 fb^-1 of integrated luminosity collected in pp̄ collisions at √s=1.96 TeV with the CDF II detector at the Fermilab Tevatron collider. Samples consisting of 470 126 W→eν candidates and 624 708 W→μν candidates yield the measurement MW=80 387±12stat.±15syst.=80 387±19 MeV/c². This is the most precise measurement of the W-boson mass to date and significantly exceeds the precision of all previous measurements combined.
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Aaltonen et al. (2012) studied this question.
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