Reappraisal of the minimal flavoured Z′ scenario

Abstract

Recent results from the intensity frontier indicate the tantalizing possibility of violation in lepton flavour universality. In light of this we revisit the minimal phenomenological Z′ model taking in account both vectorial and axial-vectorial flavour violating couplings to the charged leptons. We make a systematic study to identify the minimal framework that can simultaneously explain the recent results on anomalous magnetic moment of muon and electron while remaining in consonance with RK(⁎), Bs0−Bs0¯ mixing and angular observables in the B+→K+⁎μ+μ− channel reported by the LHCb collaboration. We demonstrate that the neutrino trident data imply a further SU(2)L violation in the leptonic couplings of the exotic Z′.