New charged Higgs effects on $\Gamma_{K_{e2}}/\Gamma_{K_{\mu 2}}$, $f_{D_s}$ and ${\cal B}(B^+ o au^+ u)$ in the Two-Higgs-Doublet model

摘要

A new scheme for Yukawa matrices is proposed for free of flavor changingneutral currents (FCNCs) at tree level in general two-Higgs-doublet model(THDM) without imposing symmetry. We find that the new type couplings ofcharged Higgs to fermions not only depend on the flavors, but also can beascribed by new CP violating phases. Unlike conventional THDM, the resulted newcharged Higgs effects could have the specialties: (a) the influence on$\Gamma(K^\pm_{e 2})/\Gamma(K^\pm_{\mu 2})$ cannot be eliminated, (b) the decayconstant of $D_s$ could be enhanced, and (c) enhancement of branching ratio for$B^+\to \tau^+ \nu$ could be achieved.