B-meson rare decays in two-Higgs-doublet models

We study B→$l^{+}$ $l^{\mathrm{-}}$, b→${\mathrm{sl}}^{+}$ $l^{\mathrm{-}}$, and B→${\mathrm{Kl}}^{+}$ $l^{\mathrm{-}}$ decays in two-Higgs-doublet models. With constraints from B→$K^{\mathrm{*}}$γ for the parameters in the model, we find that the branching ratio for B→$l^{+}$ $l^{\mathrm{-}}$ can be two to three orders of magnitude larger than in the standard model, if the Higgs pseudoscalar is very light. The branching ratios for b→${\mathrm{sl}}^{+}$ $l^{\mathrm{-}}$ and B→${\mathrm{Kl}}^{+}$ $l^{\mathrm{-}}$ can be an order of magnitude larger than the standard-model predictions.