# First Measurement of the W Boson Mass in Run II of the Tevatron

We present a measurement of the W-boson mass using 200 pb-1 of data collected in p[overline p] collisions at sqrt(s)=1.96 TeV by the CDF II detector at run II of the Fermilab Tevatron. With a sample of 63 964 W-->enu candidates and 51 128 W-->µnu candidates, we measure MW=80 413$\pm$34stat$\pm$34syst=80 413$\pm$48 MeV/c2. This is the most precise single measurement of the W-boson mass to date.

### Cited Authors

• Aaltonen, ; T, ; others,

• 2007

### Published In

• Phys. Rev. Lett.

• 99 /

• 151801 -

• 17995156