Abstract
Adding a second scalar doublet (η+,η0) and three neutral singlet fermions N1,2,3 to the Standard Model of particle interactions with a new Z2 symmetry, it has been shown that ηR0 or ηI0 is a good dark-matter candidate and seesaw neutrino masses are generated radiatively. A minimal extension of this new idea is proposed to allow for its SU(5) completion. Supersymmetric unification is then possible, and leptoquarks of a special kind are predicted at the TeV scale.
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