An electroweak gauge extension with a heavy scalar triplet realizes radiative neutrino masses and an accidental Z2 dark matter parity, with naturally small lepton number violation.
Predestined Dark Matter in Gauge Extensions of the Standard Model
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abstract
In any gauge extension of the standard model (SM) of quarks and leptons, there is a minimal set of fermion and scalar multiplets which encompasses all the particles and interactions of the SM. Included within this set, there may be a suitable dark-matter candidate. If not, one may still exist from the judicious addition of a simple fermion or scalar multiplet without any imposed symmetry. Some new examples of such predestined dark matter are discussed.
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Scotogenic mechanism from an extended $\boldsymbol{SU(2)_1 \times SU(2)_2 \times U(1)_Y}$ electroweak symmetry
An electroweak gauge extension with a heavy scalar triplet realizes radiative neutrino masses and an accidental Z2 dark matter parity, with naturally small lepton number violation.