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 — preprints:1997:ttp97-31 [2016/03/17 11:03] (current) Line 1: Line 1: + ====== TTP97-31 Calculation of the semileptonic decay width of the $\Lambda_b$ baryon ====== + + + 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 + $\Gamma_{\rm SL}(\Lambda_b)= 51\pm 9 \ |V_{cb}|^2\mbox{ps}^{-1}$ and + $\Gamma_{\rm SL}(\Lambda_b)/\Gamma_{\rm SL}(B)= 1.052\pm 0.006$. + From the latter, the semileptonic branching fraction for $\Lambda_b$ is + predicted + to be $(8.7\pm 0.7)\%$. + + |**Changhao Jin **  | + |** Phys. Rev. D56 7267-7272 1997  **  | + | {{preprints:1997:ttp97-31.pdf|PDF}} {{preprints:1997:ttp97-31.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/9709457|arXiv]]   | + | |