A New Aspect of Two-Loop Neutrino Mass Generation

We propose a class of models which the neutrino masses are generated at two-loop level. In this mechanism, only the right-handed leptonic Yukawa interaction is involved without imposing any new symmetry but the Standard Model gauge symmetry. Neutrino mass spectrum is predicted to be normal hierarchy. The novel feature of the direct relation between the neutrino masses and the Yukawa couplings enable us pin down the neutrino parameters such as the absolute scale, the Dirac CP phase via the leptonic processes. The dynamics of lepton number breaking and some collider phenomenology of this model are studied.