Abstract
In this paper, we evaluate the expectation values of four-quark operators for the inclusive beauty decays from the differences in the inclusive total decay rates, assuming that the heavy quark expansion converges at O(1/ m 3). The obtained expectation values yields the ratio τ( Λ b )/ τ( B) close to the experimental one. We further point out that the quark-hadron duality violation would be rather small allowing predictions of inclusive quantities.
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