Exclusive Semileptonic Rare Decays B→K()(?)+(?)~- in a Top Quark Two-Higgs-Doublet Model

Employing improved calculations of the decay form factors from light-cone sum rules,we evaluate the in-variant mass spectrum,forward-backward asymmetry,and lepton polarizations of the exclusive processes B→K~+~-in the SM and T2HDM.From the recent measurements of their branching ratios,we find that these processes do provideadditional bounds on the new parameters in the model considered here.After the inclusion of the new physics contribu-tions,the large enhancement of FBA,which is unobservably small within the SM and of the lepton polarization at largetan β,may precisely test the SM or reveal new physics in forthcoming accurate experiments.