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We extend the approach based on the light-cone expansion and the heavy quarkeffective theory to the inclusive semileptonic decay of an unpolarized$b$-flavored hadron. It is applied to calculate the semileptonic decay width ofthe $\Lambda_b$ 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, thesemileptonic branching fraction for $\Lambda_b$ is predicted to be $(8.7\pm0.7)%$.Comment: 11 pages, REVTe

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Calculation of the semileptonic decay width of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Λ</mml:mi></mml:mrow><mml:mrow><mml:mi>b</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>baryon

Calculation of the semileptonic decay width of theΛbbaryon