We present a left-right symmetric model in which small and finite Dirac neutrino masses are generated as two-loop radiative corrections. Typical masses of the order 10 −2 eV , 1 eV and 10 2 eV are obtained for ν e , ν μ and ν τ , respectively. The model also features a generalized seesaw mechanism for the charged fermions which is achieved by the inclusion of heavy charged singlet fermions.
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Babu et al. (1989) studied this question.