Multi-boson production and diboson polarisation at ATLAS

Measurements of multiboson production at the LHC are important probes of the electroweak gauge structure of the Standard Model and for contributions from anomalous couplings. In this talk we present recent ATLAS results on Zy production in association with jet activity. These differential measurements provide inputs and constraints on modeling of the Standard Model. In addition we will present a first measurement of di-boson polarization at the LHC. Moreover, precise boson, diboson and Higgs differential cross-section measurements are interpreted in a combined Effective Field Theory analysis, allowing to systematically probe gauge boson self-interactions.