CP violation in a two-Higgs doublet model for the top quark: B[over →]ψK_{S}

We explore charged-Higgs $\mathrm{CP}$-violating effects in an intriguing two-Higgs doublet model which accords special status to the top quark. In this model the heaviness of the top quark originates naturally from the much larger VEV of the second Higgs doublet compared to that of the first. The phenomenology of this model is quite distinct from that of the usual formulations of the two-Higgs doublet model. In particular, the model can easily account for the observed $\mathrm{CP}$ violation in the kaon sector even if the CKM matrix is real. The associated non-standard $\mathrm{CP}$ phase can be monitored through measurements of the time-dependent $\mathrm{CP}$ asymmetry in $\overrightarrow{B}\psi K_S$ in experiments at the upcoming B factories.