Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-11-27
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, no figures, no tables
Scientific paper
We prove in this letter that the electro-weak SU(4) x U(1) gauge models with spontaneous symmetry breaking can offer a natural framework for generating neutrino masses by simply exploiting the tree level realization of dimension-five effective operators. The novelty of our approach resides in the fact that the scalar sector needs not to be enlarged, since these operators are constructed as direct products among scalar multiplets already existing in the model. As an advantage, this procedure does not require additional Yukawa coefficients in the lepton sector besides the ones coming from Standard Model. The predictions in the most favorable case of our analysis are: no CP-phase violation in the neutrino sector, \sin theta_13 = -0.1985 and the absolute mass spectrum for left-handed neutrinos m1 = m2 = 0.03eV and m3 = 0.05eV . Right-handed neutrino masses lie in the sub-keV region, independently of the cut-off lambda. The latter introduces in the theory an intermediate scale (however, more close to GUT than to SM) at about 10^12 GeV which is a crucial ingredient for the left-handed neutrino phenomenology.
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