Role of Four-Quark Operators in the Inclusive $Λ_b$ Decays

We compute by QCD sum rules the matrix elements of the relevant four-quark operators appearing in the expression of the $Λ_b$ inclusive decay rates at the order $1/m_b^3$. The results suggest that $1/m_b^3$ corrections are not responsible of the observed difference between the lifetime of $Λ_b$ and $B_d$.

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