The standard model of quarks and leptons is extended to include the gauge symmetry U(1)χ which comes from SO(10)→SU(5)×U(1)χ. The radiative generation of Dirac neutrino masses through dark matter is discussed in two examples. One allows for light Dirac fermion dark matter. The other allows for self-interacting scalar dark matter with a light scalar mediator which decays only to two neutrinos.
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Ernest Ma (2019) studied this question.
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