A Lattice Study of Spectator Effects in Inclusive Decays of B-Mesons

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We compute the matrix elements of the operators which contribute to spectator effects in inclusive decays of B-mesons. The results agree well with estimates based on the vacuum saturation (factorization) hypothesis. For the ratio of lifetimes of charged and neutral mesons we find τ(B-)/τ(Bd)=1.03± 0.02± 0.03, where the first error represents the uncertainty in our evaluation of the matrix elements, and the second is an estimate of the uncertainty due to the fact that the Wilson coefficient functions have only been evaluated at tree-level in perturbation theory. This result is in agreement with the experimental measurement. We also discuss the implications of our results for the semileptonic branching ratio and the charm yield.