Measurements of multi-boson production including vector-boson scattering at ATLAS

Measurements of multiboson production at the LHC probe the electroweak gauge structure of the Standard Model for contributions from anomalous couplings. In this talk we present recent ATLAS results on the measurement of electroweak production of a Zgamma pair in association with two jets, the first observation of three W boson production, as well as the observation of the W pair production in photon-induced collisions. Also discussed is the measurement of differential cross-sections of four-lepton events and constraints on a model based on spontaneously broken B-L gauge symmetry. Moreover, precise boson and diboson differential cross-section measurements are interpreted in a combined Effective Field Theory analysis, allowing to systematically probe gauge boson self-interactions.