Penguin-Diagram Induced $B \rightarrow K_Xϕ$ Decays in the Standard Model and in the Two-Higgs-Doublet Model
We systematically analyse the gluonic penguin-induced charmless decays $B \ra K_Xϕ$($K_X$ denotes the meson state $s\bar q \;(q=u\ {\rm or}\ d)$ ), in the standard model and the two-Higgs-doublet model. These processes, being induced at one-loop level, are of great importance in measuring the virtual top quark effect in the standard model, and also in searching for the non-standard signals in the low energy region. It is shown that the QCD effect is also significant in these processes, as in the weak radiative processes $B \ra X_s γ$. We also show that the charged Higgs contribution can not provide sizable enhancements for the decays $B \ra K_Xϕ$, in contrast to the decays $B \ra K_Xγ$. It is also found that processes such as $B \ra K_1(1400)ϕ$ and $B \ra K(1460)ϕ$ have large branching fractions among $B \ra K_Xϕ$ decays.