Fermion Mass Hierarchy and Double Seesaw Mechanism in a 3-3-1 Model with an Axion

A. G. Dias, J. Leite, D. D. Lopes +1

We present a model based on the $SU(3{)}_C\otimes SU(3{)}_L\otimes U(1{)}_X$ gauge symmetry that relates the mass hierarchy of the fermions with the solution to the strong CP problem thr…