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

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Zeitschrift für Physik C Particles and Fields

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.

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Author notes

  1. F. Sever

    Present address: DPHN CEN-Saclay, F-91191, Gif-sur-Yvette, France

  2. D. Zavrtanik

    Present address: CERN, EP, 1211, Geneve 23, Switzerland

  3. W. Lourens

    Present address: State University of Utrecht, Utrecht, The Netherlands

  4. S. A. Clark

    Present address: DEC, RDL, 2B Queens House, Forbury Road, RG1 3JH, Reading, UK

Authors and Affiliations

  1. J. Stefan Institute and Department of Physics, E. Kardelj University, YU-61111, Ljubljana, Yugoslavia

    G. Kernel, D. Korbar, P. Križan, M. Mikuž, U. Seljak, F. Sever, A. Stanovnik, M. Starič & D. Zavrtanik

  2. Delft University of Technology, Delft, The Netherlands

    C. W. E. van Eijk, R. W. Hollander & W. Lourens

  3. CERN, CH-1211, Geneva 23, Switzerland

    F. G. Michaelis

  4. Nuclear Physics Laboratory, Oxford University, OX1 3RH, Oxford, UK

    N. W. Tanner

  5. Rutherford and Appleton Laboratory, Chilton, OX11 0QX, Didcot, UK

    S. A. Clark

  6. Department of Physics, University of Manitoba, R3T 2N2, Winnipeg, Manitoba, Canada

    J. V. Jovanovich

  7. Department of Physics, University of Birmingham, B15 2TT, Birmingham, UK

    J. D. Davies, J. Lowe & S. M. Playfer

Authors
  1. G. Kernel
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  2. D. Korbar
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  3. P. Križan
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  4. M. Mikuž
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  5. U. Seljak
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  6. F. Sever
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  7. A. Stanovnik
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  8. M. Starič
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  9. D. Zavrtanik
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  10. C. W. E. van Eijk
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  11. R. W. Hollander
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  12. W. Lourens
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  13. F. G. Michaelis
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  14. N. W. Tanner
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  15. S. A. Clark
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  16. J. V. Jovanovich
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  17. J. D. Davies
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  18. J. Lowe
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  19. S. M. Playfer
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Consortia

OMICRON Collaboration

Additional information

Institut für Mittelenergiephysik der ETH Zürich CH-5232 Villigen PSI Switzerland

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OMICRON Collaboration., Kernel, G., Korbar, D. et al. Measurement of the reaction π+ p→π+π+ n near threshold. Z. Phys. C - Particles and Fields 48, 201–207 (1990). https://doi.org/10.1007/BF01554466

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  • DOI: https://doi.org/10.1007/BF01554466

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