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Phys. Rev. D 54, 6610–6619 (1996)

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

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D. M. Woods*, P. M. Border, D. P. Ciampa, G. Guglielmo†, K. J. Heller, and N. B. Wallace‡
School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455

K. A. Johns
Department of Physics, University of Arizona, Tucson, Arizona 85721

Y. T. Gao§ and M. J. Longo
Department of Physics, University of Michigan, Ann Arbor, Michigan 48109

R. Rameika
Fermilab, Batavia, Illinois 60510

Received 23 February 1996; published in the issue dated 1 December 1996

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 × 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.

© 1996 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.54.6610
DOI:
10.1103/PhysRevD.54.6610
PACS:
13.88.+e, 14.20.Jn

*Present address: Department of Physics, Kansas State University, Manhattan, Kansas 66506.

†Present address: Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma 73019.

‡Present address: Instituto Nazionale di Fisica Nucleare, Via Livornese 1291, 56010 San Piero a Grado (PISA), Italy.

§Present address: University of Lanzhou, Lanzhou, China.

 
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