Discrete symmetries, invisible axion and lepton number symmetry in an economic 3-3-1 model

Dias, Alex G.; Pires, C. A. de S.; da Silva, P. S. Rodrigues

Discrete symmetries, invisible axion and lepton number symmetry in an economic 3-3-1 model

Authors

Dias, Alex G.

Pires, C. A. de S.

da Silva, P. S. Rodrigues

Description

We show that Peccei-Quinn and lepton number symmetries can be a natural outcome in a 3-3-1 model with right-handed neutrinos after imposing a Z_11 x Z_2 symmetry. This symmetry is suitably accommodated in this model when we augmented its spectrum by including merely one singlet scalar field. We work out the breaking of the Peccei-Quinn symmetry, yielding the axion, and study the phenomenological consequences. The main result of this work is that the solution to the strong CP problem can be implemented in a natural way, implying an invisible axion phenomenologically unconstrained, free of domain wall formation and constituting a good candidate for the cold dark matter.
17 pages, Revtex4