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Yutaka Okamoto

Publications and source records attributed to Yutaka Okamoto.

2 recordsLinked to original sources
arXiv1999

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

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.

hep-ph↗
arXiv1999

Comment on Radiative Neutrino Mass Matrix with a Sterile Neutrino

A mechanism of radiatively generating neutrino masses is implemented in an SU(2)_L x U(1)_Y x SU(2)'_L x U(1)'_Y model, where the first and second families respect SU(2)_L x U(1)_Y while SU(2)'_L x U(1)'_Y is specific for the third family. The fourth neutrino, nu_s, that has a U(1)_Y x U(1)'_Y coupling joins in the model to induce neutrino mixings by additional interactions with e and mu. The phenomenologically consistent oscillation of nu_s - nu_e requires a dominated coupling of nu_s to e.

hep-ph↗