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A signal of a narrowπNN resonance inpp →ppπ − π +

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Zeitschrift für Physik A Hadrons and Nuclei

Abstract

We report on the first exclusive measurement of the 2π production in NN collisions atT p=750 MeV using a H2 cluster jet target and the WASA/PROMICE detector at CELSIUS. In the invariant-mass spectrum\(M_{pp\pi ^ - } \) we observe a narrow peak at 2.063(2) GeV with a 4σ deviation relative to the MC simulations for the conventional nonresonant 2π production process. The finding is in agreement with the hypothesis of a narrowπNN resonance withI(JP)=even (0−), calledd′, postulated recently to describe the peculiar resonance-like behavior of the pionic double charge exchange on nuclei.

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Authors and Affiliations

  1. Physikalisches Institut, Univ. Tübingen, Germany

    W. Brodowski, R. Bilger, H. Clement, K. Föhl, G. Kurz, U. Siodlaczek & G. J. Wagner

  2. Dept of Radiation Sciences, Univ. Uppsala, Sweden

    H. Calén, K. Fransson, L. Gustafsson, S. Häggström, B. Höistad, A. Johansson, T. Johansson, S. Kullander, J. Moehn, A. Mörtsell, R. Ruber, A. Sukhanov & J. Zlomanczuk

  3. The Svedberg Laboratory, Uppsala, Sweden

    C. Ekström

  4. Institut für Kernphysik, KFA Jülich, Germany

    K. Kilian, W. Oelert & V. Renken

  5. Institute for Nuclear Studies, Warsaw, Poland

    A. Kupść, P. Marciniewski & J. Stepaniak

  6. Joint Institute for Nuclear Research, Dubna, Russia

    B. Morosov, A. Sukhanov & A. Zernov

  7. Institute for Theoretical and Experimental Physics, Moscow, Russia

    M. G. Schepkin

  8. Institute for Nuclear Studies, Lodz, Poland

    J. Zabierowski

  9. Institute for Experimental Physics, Warsaw, Poland

    A. Turowiecki, Z. Wilhelmi & J. Zlomanczuk

Authors
  1. W. Brodowski
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  2. R. Bilger
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  3. H. Calén
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  4. H. Clement
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  5. C. Ekström
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  6. K. Föhl
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  7. K. Fransson
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  8. L. Gustafsson
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  9. S. Häggström
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  10. B. Höistad
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  11. A. Johansson
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  12. T. Johansson
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  13. K. Kilian
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  14. S. Kullander
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  15. A. Kupść
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  16. G. Kurz
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  17. P. Marciniewski
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  18. B. Morosov
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  19. J. Moehn
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  20. A. Mörtsell
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  21. W. Oelert
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  22. V. Renken
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  23. R. Ruber
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  24. M. G. Schepkin
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  25. U. Siodlaczek
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  26. J. Stepaniak
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  27. A. Sukhanov
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  28. A. Turowiecki
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  29. G. J. Wagner
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  30. Z. Wilhelmi
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  31. J. Zabierowski
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  32. A. Zernov
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  33. J. Zlomanczuk
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Additional information

Communicated by B. Povh

Supported by BMBF (06 TÜ 669), DFG (Mu 705/3, Graduiertenkolleg), DAAD (313/S-PPP-2/94), the Swedish Institute and the Swedish Natural Science Research Council

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Brodowski, W., Bilger, R., Calén, H. et al. A signal of a narrowπNN resonance inpp →ppπ − π + . Z. Physik A — Hadrons and Nuclei 355, 5–8 (1996). https://doi.org/10.1007/s002180050070

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  • DOI: https://doi.org/10.1007/s002180050070

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