Radiatively Generated Neutrino Masses in SU(3)_L x U(1)_N Gauge Models

Abstract

In SU(3)_L x U(1)_N gauge models for electroweak interactions, we discuss how to implement a radiative mechanism of generating Majorana neutrino masses by considering the property that the Higgs scalar, which has a coupling to a charged lepton (\ell)-neutrino (ν) pair, is naturally included. The mechanism is shown to work in models with a heavy charged lepton, ω^+, in a lepton triplet (ν, \ell, ω^+) and with a heavy neutral lepton, N, in (ν, \ell, N). A minimal model with \ell and \ell^c in (ν, \ell, \ell^c) together with a sextet Higgs scalar suffers from a fine-tuning problem to suppress tree-level neutrino masses.

6 pages by RevTex and 1 figure (with a reference added)

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