Combination of CDF and D0 W-Boson Mass Measurements

We summarize and combine direct measurements of the mass of the $W$ boson in $\sqrt{s}=1.96\text{TeV}$ proton-antiproton collision data collected by CDF and D0 experiments at the Fermilab Tevatron Collider. Earlier measurements from CDF and D0 are combined with the two latest, more precise measurements: a CDF measurement in the electron and muon channels using data corresponding to $2.2 $\mathrm{f}\mathrm{b}$^{-1}$ of integrated luminosity, and a D0 measurement in the electron channel using data corresponding to $4.3{\mathrm{f}\mathrm{b}}^{-1}$ of integrated luminosity. The resulting Tevatron average for the mass of the $W$ boson is $\text{MW}=80387\pm 16\text{MeV}$. Including measurements obtained in electron-positron collisions at LEP yields the most precise value of $\MW = 80,385 \pm 15 $\text{MeV}$$.