Search for resonant W Z production in the fully leptonic final state in proton–proton collisions at √s = 13 TeV with the ATLAS detector

A search for a WZ resonance, in the fully leptonic final state (electrons and muons), is performed using 139 fb⁻¹ of data collected at a centre-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. The results are interpreted in terms of a singly charged Higgs boson of the Georgi−Machacek model, produced by WZ fusion, and of a Heavy Vector Triplet, with the resonance produced by WZ fusion or the Drell−Yan process. No significant excess over the Standard Model predictions is observed and limits are set on the production cross-section times branching ratio as a function of the resonance mass for these processes.