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Measurement of the reaction π+p→π+π+n near threshold

  • OMICRON Collaboration
  • G. Kernel
  • D. Korbar
  • P. Križan
  • M. Mikuž
  • U. Seljak
  • F. Sever
  • A. Stanovnik
  • M. Starič
  • D. Zavrtanik
  • C. W. E. van Eijk
  • R. W. Hollander
  • W. Lourens
  • F. G. Michaelis
  • N. W. Tanner
  • S. A. Clark
  • J. V. Jovanovich
  • J. D. Davies
  • J. Lowe
  • S. M. Playfer
Article

Abstract

The reaction π+p→π+π+n was studied in the vicinity of the reaction threshold at ten incident pion beam momenta from 297 MeV/c to 480 MeV/c. From data angular distributions, invariant mass spectra and integrated cross-sections were deduced. The chiral symmetry breaking parameter as determined by this reaction equals to ξ=1.56±0.26±0.39, where the first error is experimental, while the latter reflects the uncertainty in the ansatz used in the extrapolation to the reaction threshold. A comparison with the other reaction channels of the reaction πp→ππN indicates that a single parameter (ξ) is not sufficient to describe low energy ππ interactions.

Keywords

Elementary Particle Quantum Field Theory Angular Distribution Symmetry Breaking Invariant Mass 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1990

Authors and Affiliations

  • OMICRON Collaboration
  • G. Kernel
    • 1
  • D. Korbar
    • 1
  • P. Križan
    • 1
  • M. Mikuž
    • 1
  • U. Seljak
    • 1
  • F. Sever
    • 1
  • A. Stanovnik
    • 1
  • M. Starič
    • 1
  • D. Zavrtanik
    • 1
  • C. W. E. van Eijk
    • 2
  • R. W. Hollander
    • 2
  • W. Lourens
    • 2
  • F. G. Michaelis
    • 3
  • N. W. Tanner
    • 4
  • S. A. Clark
    • 5
  • J. V. Jovanovich
    • 6
  • J. D. Davies
    • 7
  • J. Lowe
    • 7
  • S. M. Playfer
    • 7
  1. 1.J. Stefan Institute and Department of PhysicsE. Kardelj UniversityLjubljanaYugoslavia
  2. 2.Delft University of TechnologyDelftThe Netherlands
  3. 3.CERNGeneva 23Switzerland
  4. 4.Nuclear Physics LaboratoryOxford UniversityOxfordUK
  5. 5.Rutherford and Appleton LaboratoryDidcotUK
  6. 6.Department of PhysicsUniversity of ManitobaWinnipegCanada
  7. 7.Department of PhysicsUniversity of BirminghamBirminghamUK

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