CP violation in a multi-Higgs-doublet model with flavor-changing neutral currents.

We study CP violation in a multi-Higgs doublet model based on a S3 × Z3 horizontal symmetry where CKM phase is not the principal source of CP violation. We consider two mechanisms for CP violation in this model: a) CP violation due to complex Yukawa couplings; and b) CP violation due to scalar-pseudoscalar Higgs boson mixings. Both mechanisms can explain the observed CP violation in the neutral Kaon system. ǫ/ǫ due to neutral Higgs boson exchange is small in both mechanisms, but charged Higgs boson contributions can be as large as 10 for a), and 10 for b). CP violation in the neutral B system is, however, quite different from the Minimal Standard Model. The neutron Electric Dipole Moment can be as large as the present experimental bound, and can be used to constrain charged Higgs boson masses. The electron EDM is one order of magnitude below the experimental bound