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In view of the discovery of a new boson by the ATLAS and CMS Collaborationsat the LHC, we present an update of the global Standard Model (SM) fit toelectroweak precision data. Assuming the new particle to be the SM Higgs boson,all fundamental parameters of the SM are known allowing, for the first time, tooverconstrain the SM at the electroweak scale and assert its validity.Including the effects of radiative corrections and the experimental andtheoretical uncertainties, the global fit exhibits a p-value of 0.07. The massmeasurements by ATLAS and CMS agree within 1.3sigma with the indirectdetermination M_H=(94 +25 -22) GeV. Within the SM the W boson mass and theeffective weak mixing angle can be accurately predicted to be M_W=(80.359 +-0.011) GeV and sin^2(theta_eff^ell)=(0.23150 +- 0.00010) from the global fit.These results are compatible with, and exceed in precision, the directmeasurements. For the indirect determination of the top quark mass we findm_t=(175.8 +2.7 -2.4) GeV, in agreement with the kinematic and cross-sectionbased measurements.

The Electroweak Fit of the Standard Model after the Discovery of a New Boson at the LHC