APS » PROLA » Phys. Rev. Lett. » Volume 88 » Issue 6

Phys. Rev. Lett. 88, 061801 (2002) [4 pages]

Λ0 Polarization in 800-GeV/cpp → pf(Λ0K+)
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J. Félix1, M. C. Berisso2 *, D. C. Christian3, A. Gara4 †, E. E. Gottschalk3, G. Gutiérrez3, E. P. Hartouni5, B. C. Knapp4, M. N. Kreisler2 ‡, S. Lee2 §, K. Markianos2 **, G. Moreno1, M. A. Reyes6, M. Sosa1, M. H. L. S. Wang2 ††, A. Wehmann3, and D. Wesson2 ‡‡
1Universidad de Guanajuato, León, Guanajuato, México
2University of Massachusetts, Amherst, Massachusetts
3Fermilab, Batavia, Illinois
4Columbia University, Nevis Laboratory, New York, New York
5Lawrence Livermore National Laboratory, Livermore, California
6Universidad Michoacana, Morelia, Michoacán, México

Received 18 June 2001; published 24 January 2002

We report results from a study of Λ0 polarization in the exclusive reaction pp→pf(Λ0K+) at 800-GeV/c. We observe a dependence of the polarization on the Λ0K+ invariant mass with large (+71%) positive polarization at small mass (1.63-GeV/c2) and large (-43%) negative polarization at large mass (2.75-GeV/c2). This observation confirms the result of the CERN ISR R608 experiment and extends the range over which the effect is observed. The strong dependence of the polarization on the Λ0K+ invariant mass suggests that the origin of the polarization is closely related to the production dynamics of the diffractively produced Λ0K+ system.


©2002 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v88/e061801
DOI: 10.1103/PhysRevLett.88.061801
PACS: 13.88.+e, 13.85.Hd, 14.20.Jn

* Present address: Shasta College, Reading, California 96049.
† Present address: IBM, Yorktown Heights, New York 10598.
‡ Present address: LLNL, Livermore, California 94551.
§ Present address: Cognex Corp., Natic, Massachusetts 01760.
** Present address: University of Washington, Seattle, Washington 98109.
†† Present address: Fermilab, Batavia, Illinois 50100.
‡‡ Present address: OAO Corporation, Athens, Georgia 30605.

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