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Two-loop Radiative Neutrino Mechanism in an SU(3)LXU(1)N
Gauge Model
By using the  symmetry, we construct an SU(3)LxU(1)N
gauge model that provides two-loop radiative neutrino masses as well as one-loop radiative neutrino masses. The generic smallness of two-loop neutrino masses leading to
 compared with one-loop neutrino masses leading to
 successfully explains
>> by invoking the
breaking. The Higgs scalar (h+) that initiates radiative mechanisms is unified into a Higgs triplet together with the standard Higgs scalar
 to form
 , which calls for three families of lepton triplets:
 (i = 1,2,3), where
denote heavy neutral leptons. The two-loop radiative mechanism is found possible by introducing a singly charged scalar, which couples to
 (i,j = 2,3).
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