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Radiative Neutrino Mass with Scotogenic Scalar Triplet

We present 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 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 $U(1)_D$ symmetry the model may have LHC signatures or be relevant to astrophysical observations, depending on the scale of $U(1)_D$ breaking.

neutrino mass; dark matter

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