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.

• Received 7 March 1988

DOI:https://doi.org/10.1103/PhysRevD.38.814