Calculation of the semileptonic decay width of the $Λ_b$ baryon

Abstract

We extend the approach based on the light-cone expansion and the heavy quark effective theory to the inclusive semileptonic decay of an unpolarized $b$-flavored hadron. It is applied to calculate the semileptonic decay width of the $Λ_b$ baryon and its ratio to that of the B meson. We obtain $Γ_{SL}(Λ_b)= 51\pm 9 |V_{cb}|^2{ps}^{-1}$ and $Γ_{SL}(Λ_b)/Γ_{SL}(B)= 1.052\pm 0.006$. From the latter, the semileptonic branching fraction for $Λ_b$ is predicted to be $(8.7\pm 0.7)%$.