Abstract
Using recent results for nonperturbative contributions to the B and D meson inclusive semileptonic widths, a model independent extraction of | V bc |, m b and m b is made from the experimentally measured B and D lifetimes and semileptonic branching ratios. Constraining the parameters of HQET at O(1/m 2 Q) by the D semileptonic width, | V bc | is found to in the range 0.040 < | V bc | < 0.057. The c and b quark masses are not well constrained due to uncertainty in the relevant scale of α s. These results assume the validity of perturbative QCD at the low scales relevant to semileptonic charm decay. Without making this assumption, somewhat less stringent bounds on V bc from B decay be obtained.
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