Abstract :
We have demonstrated that an SU(2)qL × SU(2)lL × U(1)Y model including S3 × Z4 discrete symmetry and appropriate Higgs fields gives rise to almost degenerate Majorona neutrino masses of (1–3) eV through the usual see-saw mechanism due to the introduction of an intermediate mass scale at which lepton number violation occurs. We have considered two different types of discrete symmetry transformations (Type A and Type B). The hierarchy of neutrino mass obtained due to the Type A transformation reconciles with the solar and atmospheric neutrino deficits whereas the Type B transformation generates an inverted mass hierarchy of neutrinos which explains the solar and the LSND experimental results.
