Search for a new ′ gauge boson via the →±(*)→′±→±∓± process in collisions at √=13  TeV with the ATLAS detector

A search for a new ′ gauge boson predicted by − models, based on charged-current Drell–Yan production, ⁢→±(*)→′⁢±⁢→±⁢∓⁢±⁢, is presented. The data sample used corresponds to an integrated luminosity of 140 fb−1 of proton–proton collisions at √=13 TeV recorded by the ATLAS detector at the Large Hadron Collider. The search examines a final state of 3⁢ plus large missing transverse momentum. Upper limits are set on the ′ production cross section times branching ratio in the mass range of 5–81 GeV. After combining with the previous ′ search using the neutral-current Drell–Yan production with a 4⁢ final state, the most stringent exclusion limits to date are achieved in the parameter space of the ′ coupling strength and mass.