![]() This model, which incorporates quantum mechanics, special relativity, gauge symmetry, and group theory, currently describes most particle physics measurements with high accuracy. The observation of the Higgs boson ( 1– 4) at the Large Hadron Collider (LHC) ( 5, 6) has validated the last missing piece of the standard model (SM) ( 7– 9) of elementary particle physics. ![]() This measurement is in significant tension with the standard model expectation. A sample of approximately 4 million W boson candidates is used to obtain M W = 80, 433.5 ± 6.4 stat ± 6.9 syst = 80, 433.5 ± 9.4 MeV / c 2, the precision of which exceeds that of all previous measurements combined (stat, statistical uncertainty syst, systematic uncertainty MeV, mega–electron volts c, speed of light in a vacuum). We measure the W boson mass, M W, using data corresponding to 8.8 inverse femtobarns of integrated luminosity collected in proton-antiproton collisions at a 1.96 tera–electron volt center-of-mass energy with the CDF II detector at the Fermilab Tevatron collider. After observation of the Higgs boson, a measurement of the W boson mass provides a stringent test of the model. ![]() The Higgs boson was the last missing component of the model. ![]() 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. Zucchelli +395 authors +393 authors +388 authors fewer Authors Info & Affiliations ![]()
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