Polarization of Ξ- and Ω- hyperons produced from neutral beams

We have studied the polarization of Ξ- and Ω- hyperons produced by high energy neutral particle beams. An unpolarized neutral beam striking a target at ±1.8 mrad produced 1.4×10⁷Ξ-‘s with an average momentum of 395 GeV/c which were unpolarized, within a sensitivity limit of 0.007, and 2.2 × 2.2 × 10⁵ Ω-‘s with a polarization of +0.042±0.007 at an average momentum of 374 GeV/c. A polarized neutral beam striking a target at 0.0 mrad produced 7.1×10⁵Ξ-‘s which had a polarization of -0.118±0.004 at an average momentum of 393 GeV/c and 1.8 × 10⁴ Ω-‘s with a polarization of -0.069±0.023 at an average momentum of 394 GeV/c. The polarized neutral beam measurement is in good agreement with a previous measurement. The unpolarized neutral beam results are not understood in the context of the current models of hyperon polarization.