Inclusive rare Λ

\nInclusive Hb → Xs γ decays, with Hb a beauty baryon, are treated exploiting an expansion up to the third order in the inverse of the b quark mass mb and to LO in αs, keeping the dependence on the hadron spin. Double distribution d2Γ/dy d cos θ P is computed for polarized baryons, with y = 2 Eγ/mb, Eγ the photon energy and θP the angle between the baryon spin vector and the photon momentum in the Hb rest-frame. Modifications to the photon polarization asymmetry can probe effects of physics beyond the Standard Model. A systematic method to treat the singular terms in the photon energy spectrum obtained by the OPE is proposed.\n