Radiative neutrino mass with scotogenic scalar triplet

We present a radiative one-loop neutrino mass model with hypercharge zero scalar triplet in conjunction with another charged singlet scalar and an additional vectorlike lepton doublet. We study three variants of this mass model: the first one without additional beyond-SM symmetry, the second with imposed DM-stabilizing discrete Z2Z2 symmetry, and the third in which this Z2Z2 symmetry is promoted to the gauge symmetry U(1)DU(1)D. The two latter cases are scotogenic, with a neutral component of the scalar triplet as a dark matter candidate. In first scotogenic model the Z2Z2-odd dark matter candidate is at the multi-TeV mass scale, so that all new degrees of freedom are beyond the direct reach of the LHC. In second scotogenic setup, with broken U(1)DU(1)D symmetry the model may have LHC signatures or be relevant to astrophysical observations, depending on the scale of U(1)DU(1)D breaking.