The mass of the W boson, a mediator of the weak force between
elementary particles, is tightly constrained by the symmetries of the
standard model of particle physics. The Higgs boson was the last missing
component of the model. After the observation of the Higgs boson, a
measurement of the W boson mass provides a stringent test of the model. We
measure the W boson mass using data corresponding to 8.8 inverse
femtobarns of integrated luminosity collected in proton-antiproton
collisions at a 1.96 TeV center-of-mass energy with the CDF II detector
at the Fermilab Tevatron collider.