Year: 2012
Type: article
Abstract: We prove in this paper that the electroweak $SU(4{)}_{L}\ensuremath{\bigotimes}U(1{)}_{X}$ 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. There is a unique generic matrix for Yukawa couplings in the neutrino sector. The charged leptons are already in their diagonal basis. This framework can lead to a suitable fit of the established phenomenology for the left-handed neutrinos, while the right-handed neutrino masses come out in the sub-keV region, independently of the cutoff $\ensuremath{\Lambda}$. The latter introduces in the theory an intermediate scale (however, more close to GUT than to SM) at about ${10}^{12}\text{ }\text{ }\mathrm{GeV}$ which is a crucial ingredient for the left-handed neutrino phenomenology.
Author: Adrian Palcu
Institution: Aurel Vlaicu University of Arad
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2170769785