Rare ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$ decay in the two-Higgs doublet model of type-III

Abstract

The rare exclusive dileptonic ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$ $(\ell =\mu ,\tau )$ 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 $\Lambda$ baryon polarizations over the standard model is obtained. Measurements of these quantities will be useful for establishing the two-Higgs doublet model.

Comments: 33 pages, 5 figures