Precision Tests of the Electroweak Sector of the Standard Model

The electroweak sector of the Standard Model (SM) of particles can be tested either with precision measurements of fundamental observables or with direct tests of its underlying non-Abelian gauge structure. Precise measurements of the weak mixing angle and the mass of the W boson probe the consistency of the SM. Measurements of vector boson scattering processes probe the gauge structure of the electroweak sector. Recent measurements of the electroweak gauge boson production cross sections and first VBS measurements in proton-proton collisions at 13 TeV at the Large Hadron Collider (LHC) are discussed. At the LHC, VBS is characterized by presence of two gauge bosons in association with two forward jets with large rapidity separation and a large djiet mass. Searches of anomalous quartic gauge couplings are also reported.