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Phys. Rev. D 44, 3402–3418 (1991)

Measurement of the polarization and magnetic moment of Ξ̅ + antihyperons produced by 800-GeV/c protons

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P. M. Ho*, M. J. Longo, and A. Nguyen
Department of Physics, University of Michigan, Ann Arbor, Michigan 48109

K. B. Luk†, C. James, and R. Rameika
Fermilab, Batavia, Illinois 60510

J. Duryea, G. Guglielmo, K. Heller, and K. Johns‡
School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455

H. T. Diehl§, S. Teige**, G. B. Thomson, and Y. Zou
Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854

Received 21 March 1991; published in the issue dated 1 December 1991

The polarization of Ξ̅ + hyperons produced by 800-GeV/c protons in the inclusive reaction p+Be→Ξ̅ ++X has been measured using a sample of 70000Ξ̅ + decays. The average polarization of the Ξ̅ +, at a mean xF=0.39 and pt=0.76 GeV/c, is -0.097±0.012±0.009, compared to -0.102±0.012±0.010 for the Ξ-. The large polarization found for the Ξ̅ + is not expected in any model for polarization of inclusively produced hyperons. The magnetic moment of the Ξ̅ + was measured to be 0.657±0.028±0.020 nuclear magnetons (μN), compared to (-0.674±0.021±0.020)μN for the Ξ-, in good agreement with CPT invariance.

© 1991 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.44.3402
DOI:
10.1103/PhysRevD.44.3402
PACS:

*Present address: Lawrence Berkeley Laboratory, Berkeley, CA 94720.

†Present address: Department of Physics, University of California, Berkeley, CA 94720.

‡Present address: Department of Physics, University of Arizona, Tucson, AZ 85721.

§Present address: Fermilab, Batavia, IL 60510.

**Present address: Department of Physics, Indiana University, Bloomington, IN 47405.

 
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