Radiative neutrino mass and Majorana dark matter within an inert Higgs doublet model

We consider an extension of the standard model (SM) with an inert Higgs doublet and three Majorana singlet fermions to address both origin and the smallness of neutrino masses and dark matter (DM) problems. In this setup, the lightest Majorana singlet fermion plays the role of DM candidate and the model parameter space can be accommodated to avoid different experimental constraints such as lepton flavor violating processes and electroweak precision tests. The neutrino mass is generated at one-loop level a la Scotogenic model and its smallness is ensured by the degeneracy between the $CP$-odd and $CP$-even scalar members of the inert doublet. Interesting signatures at both leptonic and hadronic colliders are discussed.