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Enhancement of πAππA threshold cross sections by in-medium ππ final state interactions

R. Rapp, J. W. Durso, Z. Aouissat, G. Chanfray, O. Krehl, P. Schuck, J. Speth, and J. Wambach
Phys. Rev. C 59, R1237(R) – Published 1 March 1999
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Abstract

We address the problem of pion production in low-energy π-nucleus collisions. For the production mechanism, we assume a simple model consisting of a coherent sum of single pion exchange and the excitation—followed by the decay into two pions and a nucleon—of the N*(1440) resonance. The production amplitude is modified by the final state interaction between the pions calculated using the chirally improved Jülich meson exchange model including the polarization of the nuclear medium by the pions. The model reproduces well the experimentally observed πAππA cross sections, especially the enhancement with increasing A of the π+π mass distribution in the threshold region.

  • Received 2 October 1998

DOI:https://doi.org/10.1103/PhysRevC.59.R1237

©1999 American Physical Society

Authors & Affiliations

R. Rapp1, J. W. Durso2,3, Z. Aouissat4, G. Chanfray5, O. Krehl2, P. Schuck6, J. Speth2, and J. Wambach4

  • 1Department of Physics and Astronomy, SUNY at Stony Brook, Stony Brook, New York 11794-3800
  • 2Physics Department, Mount Holyoke College, South Hadley, Massachusetts 01075
  • 3Institut für Kernphysik, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany
  • 4Institut für Kernphysik, Schloßgartenstrasse 9, TU-Darmstadt, D-64289 Darmstadt, Germany
  • 5IPN, IN2P3-CNRS/Université Claude Bernard Lyon I, 43 Boulevard du 11 Novembre 1918 F-69622 Villeurbanne Cedex, France
  • 6ISN, IN2P3-CNRS/Université Joseph Fourier, 53 Avenue de Martyrs, F-38026 Grenoble Cedex, France

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Issue

Vol. 59, Iss. 3 — March 1999

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