$$Z'$$ Z ′ portal dark matter in $$B-L$$ B - L scotogenic Dirac model

Abstract

In this paper, we perform a detail analysis on the phenomenology of $$Z'$$ portal scalar and Dirac fermion dark matter in $$B-L$$ scotogenic Dirac model. Unconventional $$B-L$$ charge Q is assigned to the right-handed neutrino $$\nu _R$$ in order to realise scotogenic Dirac neutrino mass at one-loop level, where three typical value $$Q=-\,\frac{1}{4},-\,4,\frac{3}{2}$$ are chosen to illustrate. Observational properties involving dilepton signature at LHC, relativistic degrees of freedom $$N_\text {eff}$$ , dark matter relic density, direct and indirect detections are comprehensively studied. Combined results of these observables for the benchmark scenarios imply that the resonance region $$M_\text {DM}\sim M_{Z'}/2$$ is the viable parameter space. Focusing on the resonance region, a scanning for TeV-scale dark matter is also performed to obtain current allowed and future prospective parameter space.