Probing Z ′ Boson in Diboson Production in Semilepton Final State with the ATLAS Data at the LHC at √ s = 13 TeV

The study of electroweak boson pair production is a powerful test of the spontaneously broken gauge symmetry of the Standard Model (SM) and can be used to search for phenomena beyond the SM. New heavy neutral bosons Z ′ decaying to charged gauge boson pairs W+W− are predicted by many scenarios of new physics, including models with extended gauge sector. The diboson production allows to place stringent constraints on the Z ′ boson parameters such as Z−Z ′ mixing angle and Z ′ mass, MZ′ . We find that the present bounds on the Z −Z ′ mixing angle obtained with data comprised of 13.2 fb−1 of pp collisions at √ s = 13 TeV and recorded by ATLAS detector at the CERN LHC are quite competitive with those derived from the global analysis of the electroweak data