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Role of Δ exchange for p\(\) annihilation into two-pion and three-pion channels

  • M. Betz
  • E.A. Veit
  • J. Haidenbauer

Abstract:

p\(\) annihilation into two pions and three pions is studied in a baryon exchange model. Annihilation diagrams involving nucleon as well as Δ-resonance exchanges are included consistently in the two- and three-pion channels. Effects from the initial-state interaction are fully taken into account. A comparison of the influence of the Δ exchange on the considered annihilation channels is made and reveals that its importance for three-pion annihilation is strongly reduced as compared to two-pion annihilation. It is found that annihilation into three uncorrelated pions can yield up to 10% of the total experimentally observed three-pion annihilation cross-section.

PACS. 13.75.Cs Nucleon-nucleon interactions (including antinucleons, deuterons, etc.) – 14.20.-c Baryons (including antiparticles) – 21.30.Cb Nuclear forces in vacuum – 25.43.+t Antiproton-induced reactions 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2002

Authors and Affiliations

  • M. Betz
    • 1
  • E.A. Veit
    • 1
  • J. Haidenbauer
    • 2
  1. 1.Instituto de Fısica - Universidade Federal do Rio Grande do Sul, Cx. P. 15051; CEP 91501-970, Porto Alegre, BrazilBR
  2. 2.Institut für Kernphysik, Forschungszentrum Jülich GmbH, D-52425 Jülich, GermanyDE

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