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Phys. Rev. D 49, 4373 - 4393 (1994)

Pion-pion correlations at low relative momentum produced in p-p collisions at 27.5 GeV/c

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J. Uribe *, E. P. Hartouni, D. A. Jensen †, and M. N. Kreisler
Department of Physics and Astronomy, University of Massachusetts, Amherst, Massachusetts 01003

M. D. Church †, E. E. Gottschalk ‡, B. C. Knapp, W. Sippach, B. J. Stern §, and L. R. Wiencke **
Columbia University, Nevis Laboratories, Irvington, New York 10533

D. C. Christian, G. Gutierrez, S. D. Holmes, and A. Wehmann
Fermilab, Batavia, Illinois 60510

C. Avilez
Instituto de Fisica, Universidad de Guanajuato, Leon, Gto., Mexico

M. Forbush ††, F. R. Huson, and J. T. White
Department of Physics, Texas A&M University, College Station, Texas 77843

Received 29 November 1993

We have measured the momentum correlation of pion pairs produced in the collisions of 27.5 GeV/c protons in liquid hydrogen. By considering events for which all final state particles have been measured, we have succeeded in reducing backgrounds due to particle misidentification below 5% for π+ and 1% for π-. Our use of a precision magnetic spectrometer has provided an accurate determination of particle momenta and excellent acceptance for particle pairs with small relative momentum essential for correlations studies. A large data sample of fully reconstructed events (1 × 106) allows us to analyze the correlations for π+π+ and π-π- pairs separately, and also as a function of the final state multiplicity. We find that the pion pair correlations scale 0.98 fm describes the data well. We do not find any indication of multiplicity dependence of the correlation scale for multiplicities from 6 to 14 final state particles.


©1994 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevD.49.4373
DOI: 10.1103/PhysRevD.49.4373
PACS: 13.85.Hd

* Present address: University of Texas, M. D. Anderson Cancer Center, Houston, TX 77030.
† Present address: Fermilab, Batavia, IL 60510.
‡ Present address: Carnegie-Mellon University, Pittsburgh, PA 15213.
§ Present address: AT&T Research Laboratories, Murray Hill, NJ 07974.
** Present address: University of Utah, Salt Lake City, UT 84112.
†† Present address: University of California, Davis, CA 95616.

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