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Inclusive semileptonic decays of beauty baryons are studied using the heavyquark expansion to ${\cal O}(1/m_b^3)$, at leading order in $\alpha_s$. Thecase of a polarized decaying baryon is examined, with reference to $\Lambda_b$.An extension of the Standard Model effective Hamiltonian inducing $b \to U \ell{\bar \nu}_ \ell$ transitions ($U=u,\,c$ and $\ell=e,\,\mu,\,\tau$) isconsidered, which comprises the full set of D=6 semileptonic operators withleft-handed neutrinos. The effects of the new operators in several observablesare described.

Inclusive semileptonic $\Lambda_b$ decays in the Standard Model and beyond