Novel CP-violating effects in B decays from a charged Higgs boson in a two-Higgs-doublet model for the top quark

We explore charged-Higgs CP-violating effects in a specific type III two-Higgs-doublet model which is theoretically attractive as it accommodates the large mass of the top quark in a natural fashion. Two new CP-violating phases arise from the right-handed up quark sector. We consider CP violation in both neutral and charged B decays. Some of the important findings are as follows. (1) Large direct-CP asymmetry is found to be possible for B+/--->psi/JK(+/-). (2) A sizable D (D) over bar mixing effect at the percent level is found to be admissible despite the stringent constraints from the data on K (K) over bar mixing, b --> s gamma and B- --> tau<(nu)over bar> decays. (3) A simple but distinctive CP asymmetry pattern emerges in decays of B-d and B-s masons, including B-d --> psi/J K-S, D+D-, and B-s --> Ds+Ds-, psi eta/eta', psi/J K-S. (4) The effect of D (D) over bar mixing on the CP asymmetry in B+/- --> D/(D) over bar K+/- and on the extraction of the angle gamma of the unitarity triangle from such decays can be significant.