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Differently from the canonical seesaw mechanism, which is grounded in grand unified theories, the inverse seesaw mechanism lacks a special framework that realizes it naturally. In this work we advocate that the 3-3-1 model with right-handed neutrinos has such an appropriate framework to accommodate the inverse seesaw mechanism. We also discuss the smallness of the lepton number violating mass and estimate the branching ratio for the rare lepton flavor violation process μ → eγ. [ABSTRACT FROM AUTHOR]

The minimal 3-3-1 model is perturbative until energies around 4-5 TeV, posing a challenge to generate neutrino masses at eV scale, mainly if one aims to take advantage of the seesaw mechanism. As a means to circumvent this problem, we propose a modification of the model such that it accommodates the type I and type II seesaw mechanisms altogether. We show that the conjunction of both mechanisms yield a neutrino mass expression suppressed by a high power of the cutoff scale, M5, in its denominator. With such a suppression term, we naturally obtain neutrino masses at eV scale when M is around few TeV. We also investigate the size of lepton flavor violation through the process µ → ey. [ABSTRACT FROM AUTHOR]