Precision measurements and searches with single and multiple gauge bosons with the ATLAS detector

The ATLAS collaboration has carried out a set of measurements at center-of-mass energies of 8 TeV and 13 TeV which provide stringent tests of the electroweak sector of the Standard Model, specifically on di- and multibosonproduction cross sections. Such measurements include inclusive and differential cross sections for the production of two heavy gauge bosons (WW, WZ, ZZ) in the leptonic or semileptonic channels, the search for the production of three W bosons, the production of a Z boson in association with one or two photons, a Z or W boson in the vector-boson fusion channel, the observation of vector-boson scattering in the WW channel and the search for WZ production via vector-boson scattering. These measurements are compared to (N)NLO predictions of the Standard Model and provide model-independent constraints on new physics, by setting limits on anomalous triple or quartic gauge-boson couplings. We also present a measurement of the exclusive gamma+gamma >WW production cross-section and a search for exclusive H>WW production. The inclusive production of single W and Z/gamma* bosons are standard candles at hadron colliders. Measurements of their production cross-sections integrated and differential in several variables have been carried out at centre-of-mass energies of 7, 8, and 13 TeV and are compared to higher-order QCD calculations and state-of-the-art Monte Carlo simulations. These measurements can be used to constrain the parton densities of the proton, in particular in the quark and photon sectors, and provide stringent tests of soft resummation effects and hard emissions for small and large momentum transfers. The ATLAS Collaboration has also carried-out a measurement of the complete set of coefficients that describe the angular distributions of the decay leptons in Z events.