Revelations of the E6/U(1)N model: Two-loop neutrino mass and dark matter

The E6/U(1)N gauge extension of the Supersymmetric Standard Model, first proposed by Ma, is shown to have exactly the requisite ingredients to realize the important new idea that dark matter is the origin of neutrino mass. With the implementation of a discrete Z2×Z2 symmetry, and particle content given by three 27̲ representations of E6, neutrino masses are naturally generated in two loops, with candidates of dark matter in the loops. All particles of this model are expected to be at or below the TeV scale, allowing them to be observable at the LHC.