The global electroweak Standard Model fit after the Higgs discovery

Understand

We present an update of the global Standard Model (SM) fit to electroweak precision data under the assumption that the new particle discovered at the LHC is the SM Higgs boson.

• In this scenario all parameters entering the calculations of electroweak precision observalbes are known, allowing, for the first time, to over-constrain the SM at the electroweak scale and assert its validity.
• Within the SM the W boson mass and the effective weak mixing angle can be accurately predicted from the global fit.
• The results are compatible with, and exceed in precision, the direct measurements.