Rare Λb → Λℓ +ℓ - Decay in the two-Higgs doublet model of type III

Abstract

The rare exclusive dileptonic Λb → Λℓ +ℓ - (ℓ = μ, τ) decays are investigated in the general two-Higgs-doublet model of type III. A significant enhancement to the branching ratios, differential branching ratios, leptons forward-backward asymmetry, and the Λ baryon polarizations over the standard model is obtained. Measurements of these quantities will be useful for establishing the two-Higgs doublet model.