Neutrino masses in the SU(4)L ⊗ U(1)X electroweak extension of the Standard Model

Abstract

We study the neutrino mass generation in the SU (4) L ⊗ U (1) X electroweak extension of the standard model by considering non-renormalizable dimension five effective operators. It is shown that there exist two topologies for the realizations of such an operator at the tree-level and for one of the three-family models is explore the neutrino phenomenology after extending its particle content with an SU (4) L fermion singlet and a scalar decuplet. Constraints in the available parameters space of the model are partially discussed.