Scalar dark matter, leptogenesis and \(0\nu\beta\beta\) in minimal scotogenic model

Abstract

We study the minimal scotogenic model constituting an additional inert Higgs doublet and three sets of right-handed neutrinos. This model connects dark matter, baryon asymmetry of the Universe, neutrinoless double beta decay (\(0\nu\beta\beta\)) in light of the latest experimental data. In view of the recent constraints from Planck data, baryogenesis is obtained for TeV scale heavy neutral singlet fermion(\(N_{1}\)) with the active neutrino masses satisfying experimental bound from KamLAND-Zen. We primarily focus on the intermediate-mass region of dark matter within \(M_W<M_{DM}\le550\) GeV, where observed relic density is suppressed due to co-annihilation processes. We consider thermal as well as the non-thermal approach of dark matter production and explore the possibility of the lightest stable candidate being a dark matter candidate. Within the IHDM desert, we explore a new allowed region of dark matter masses for the non-thermal generation of dark matter with a mass splitting of 10 GeV among the inert scalars, keeping intact constraints from Planck limit as well as direct detection experiment XENON1T.