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We study the neutrino mass generation in the $SU(4)_L \otimes U(1)_X$electroweak extension of the standard model by considering non-renormalizabledimension five effective operators. It is shown that there exist two topologiesfor the realizations of such an operator at the tree-level and for one of thethree-family models is explore the neutrino phenomenology after extending itsparticle content with an $SU(4)_L$ fermion singlet and a scalar decuplet.Constraints in the available parameters space of the model are partiallydiscussed.

Neutrino masses in the $SU(4)_L \otimes U(1)_X$ electroweak extension of the standard model