1206.5741 (W. Caetano et al.)

Combining type I and type II seesaw mechanisms in the minimal 3-3-1
model    [PDF]

W. Caetano, D. Cogollo, C. A. de S. Pires, P. S. Rodrigues da Silva

The minimal 3-3-1 model is perturbative until energies around 4-5TeV, 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, $M^5$, 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 $\mu \rightarrow e\gamma$.

View original: http://arxiv.org/abs/1206.5741