Perturbative QCD analysis of $B(B\to Xl\barν)$, charm yield $<n_c>$ in B decay, and $τ(Λ_b)/τ(B_d)$

Details Perturbative QCD analysis of $B(B\to Xl\barν)$, charm yield $<n_c>$ in B decay, and $τ(Λ_b)/τ(B_d)$ Perturbative QCD analysis of $B(B\to Xl\barν)$, charm yield $<n_c>$ in B decay, and $τ(Λ_b)/τ(B_d)$

1998-09-27

arxiv.org/abs/hep-ph/9809553v2

Phys.Lett. B457 (1999) 341-346

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages in a latex file, numerical results are revised, We obtain $B(B\to Xl\bar{\nu})=10.16%$, $<n_c>=1.17$, $\tau(\Lambda_b

Scientific paper

10.1016/S0370-2693(99)00542-0

We apply perturbative QCD factorization theorems to inclusive heavy hadron
decays, and obtain simultaneously a low semileptonic branching ratio $B(B\to
Xl\bar{\nu})=10.16%$, the average charm yield $=1.17$ per $B$ decay, a
small lifetime ratio $\tau(\Lambda_b)/\tau(B_d)=0.78$, and the correct absolute
decay widths of the $B$ meson and of the $\Lambda_b$ baryon.

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