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 Z(2) symmetry, and the third in which this Z(2) symmetry is promoted to the gauge symmetry U(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 Z(2)-odd dark matter candidate is at the multiTeV 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)(D) symmetry the model may have LHC signatures or be relevant to astrophysical observations, depending on the scale of U(1)(D) breaking. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.