Phys. Rev. Lett. 82, 5213–5216 (1999)

Study of Λ⁰ Polarization in Four Different Exclusive pp Reactions at 27.5 GeV/ c

Abstract

References

Citing Articles (4)

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J. Félix¹, C. Avilez^1,*, D. C. Christian³, M. D. Church^4,†, M. Forbush^5,‡, E. E. Gottschalk^4,§, G. Gutierrez³, E. P. Hartouni^2,**, S. D. Holmes³, F. R. Huson⁵, D. A. Jensen^2,††, B. C. Knapp⁴, M. N. Kreisler^2,‡‡, G. Moreno¹, J. Uribe^2,a, B. J. Stern^4,b, M. H. L. S. Wang^2,c, A. Wehmann³, L. R. Wiencke^4,d, and J. T. White⁵
¹Universidad de Guanajuato, León, Guanajuato, México
²University of Massachusetts, Amherst, Massachusetts 01003
³Fermilab, Batavia, Illinois 60510
⁴Columbia University, Nevis Laboratories, Irvington, New York 10533
⁵Department of Physics, Texas A&M University, College Station, Texas 77843

Received 18 December 1997; revised 19 February 1999; published in the issue dated 28 June 1999

We have measured the x_F and P_T dependence of the polarization of Λ⁰ hyperons produced in exclusive final states pp→pΛ⁰K⁺π⁺π^-, pp→pΛ⁰K⁺π⁺π^-π⁺π^-, pp→pΛ⁰K⁺π⁺π^-π⁺π^-π⁺π^-, and pp→pΛ⁰K⁺π⁺π^-π⁺π^-π⁺π^-π⁺π^- at 27.5 GeV/ c. We present an empirical parametrization for Λ⁰ polarization as a function of x_F and P_T: P = (-0.443±0.037)x_FP_T for -1≤x_F≤1 and 0≤P_T≤1.8GeV/c. This parametrization is independent of the final state and provides a good description of the data. We note that the mechanism responsible for Λ⁰ polarization appears to be independent of the production mechanism.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.82.5213

DOI:

10.1103/PhysRevLett.82.5213

PACS:

13.88.+e, 13.85.Hd, 14.20.Jn

^*Deceased.

^†Present address: Fermilab, Batavia, IL 60510.

^‡Present address: University of California, Davis, CA 95616.

^§

^**Present address: Lawrence Livermore National Laboratory, Livermore, CA 94550.

^††

^‡‡

^aPresent address: M. D. Anderson Cancer Center, University of Texas, Houston, TX 77030.

^bPresent address: AT&T Research Laboratories, Murray Hill, NJ 07974.

^dPresent address: University of Utah, Salt Lake City, UT 84112.

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Phys. Rev. Lett. 82, 5213–5216 (1999)

Study of Λ0 Polarization in Four Different Exclusive pp Reactions at 27.5 GeV/ c

Study of Λ⁰ Polarization in Four Different Exclusive pp Reactions at 27.5 GeV/ c