SU(5) completion of the dark scalar doublet model of radiative neutrino mass

Adding a second scalar doublet (eta(+), eta(0)) and three neutral singlet fermions N-1,N-2,N-3 to the Standard Model of particle interactions with a new Z(2) symmetry, it has been shown that eta(0)(R)or eta(1)(l) 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 S-U(5) completion. Supersymmetric unification is then possible, and leptoquarks of a special kind are predicted at the TeV scale. (C) 2007 Elsevier B.V. All rights reserved.