CP Violation in B Decays in a 2-Higgs Doublet Model for the Top Quark

Abstract

In the absence of natural flavor conservation, multi-Higgs doublet models generally contain new sources of CP violation and anomalous charged Higgs Yukawa couplings. We present a charged-Higgs CP violation study of one such two-Higgs doublet model (2HDM) which treats the top quark differently from the other quarks. The phenomenological implications for the K-Kbar system and for B decays differ significantly from those of the standard model (SM) and of the 2HDM's with natural flavor conservation. In particular, the SM phase in this model could take a wide range of values, and the CP asymmetry in the "gold-plated" decay mode B to J/psi K_S could be quite different from and even of opposite sign relative to the SM prediction. A new mechanism is also noted for generating a large neutron electric dipole moment which is close to the present experimental limit.