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

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

1997-09-25

arxiv.org/abs/hep-ph/9709457v1

Phys.Rev. D56 (1997) 7267-7272

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, REVTeX

Scientific paper

10.1103/PhysRevD.56.7267

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 $\Lambda_b$ baryon and its ratio to that of the B meson. We obtain $\Gamma_{SL}(\Lambda_b)= 51\pm 9 |V_{cb}|^2{ps}^{-1}$ and $\Gamma_{SL}(\Lambda_b)/\Gamma_{SL}(B)= 1.052\pm 0.006$. From the latter, the semileptonic branching fraction for $\Lambda_b$ is predicted to be $(8.7\pm 0.7)%$.

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