Spontaneous CP-violation within the framework of SU(2)L x SU(2)R x U(1) models with manifest CP invariance revisited

In this paper, the case of spontaneous CP violation for large m, is reanalyzed and the validity of perturbation theory is checked by calculating the second order corrections to the CKM matrix. For a very large right-handed mass scale, the perturbation theory breaks down in some cases. While in other cases consistent with perturbation theory, the model predicts too large ε'/ε. Two possible alternatives are: models with low right-handed mass scales with three generations and models with heavy right-handed mass scales with four generations, avoid the above problems and values of ε'/ε and electric dipole moment of the neutron consistent with present data are obtained