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Study of baryon and search for dibaryon resonances by the \(pp \rightarrow pp\pi^ + \pi^-\) reaction

  • E. Doroshkevich
  • M. Bashkanov
  • W. Brodowski
  • R. Bilger
  • H. Calén
  • H. ClementEmail author
  • C. Ekström
  • K. Fransson
  • J. Greiff
  • S. Häggström
  • B. Höistad
  • J. Johanson
  • A. Johansson
  • T. Johansson
  • K. Kilian
  • S. Kullander
  • A. Kupsc
  • P. Marciniewski
  • R. Meier
  • B. Morosov
  • W. Oelert
  • J. Pätzold
  • R. J. M. Y. Ruber
  • W. Scobel
  • J. Stepaniak
  • A. Sukhanov
  • A. Turowiecki
  • G. J. Wagner
  • Z. Wilhelmi
  • J. Zabierowski
  • J. Zlomanczuk
Article

Abstract.

Exclusive measurements of the two-pion production channel \(pp \rightarrow pp\pi^ + \pi^-\) have been carried out near threshold at CELSIUS with the PROMICE/WASA detector. They reveal \(pp \rightarrow pp^*(1440)\rightarrow pp\sigma \rightarrow pp(\pi^ + \pi^-)_{I = \ell = 0}\) as the dominant process at these energies, however, the data exhibit also significant contributions from \(p^*(1440) \rightarrow \Delta \pi \rightarrow p(\pi^ + \pi^-)_{I = \ell = 0}\). From the observed interference of these Roper decay routes their relative branching ratio is derived. The status on the search for NN-decoupled \(NN\pi\)-resonances is reviewed with regard to recent experimental searches in the pionic double charge exchange in nuclei, the two-pion production in nucleon-nucleon collisions, the photo pion-production on the deuteron and the electro pion-production in nuclei.

Keywords

Significant Contribution Charge Exchange Dominant Process Experimental Search Production Channel 
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 Berlin/Heidelberg 2003

Authors and Affiliations

  • E. Doroshkevich
    • 1
  • M. Bashkanov
    • 1
  • W. Brodowski
    • 1
  • R. Bilger
    • 1
  • H. Calén
    • 2
  • H. Clement
    • 1
    Email author
  • C. Ekström
    • 2
  • K. Fransson
    • 3
  • J. Greiff
    • 4
  • S. Häggström
    • 3
  • B. Höistad
    • 3
  • J. Johanson
    • 3
  • A. Johansson
    • 3
  • T. Johansson
    • 3
  • K. Kilian
    • 5
  • S. Kullander
    • 3
  • A. Kupsc
    • 2
  • P. Marciniewski
    • 3
  • R. Meier
    • 1
  • B. Morosov
    • 6
  • W. Oelert
    • 5
  • J. Pätzold
    • 1
  • R. J. M. Y. Ruber
    • 3
  • W. Scobel
    • 4
  • J. Stepaniak
    • 7
  • A. Sukhanov
    • 6
  • A. Turowiecki
    • 8
  • G. J. Wagner
    • 1
  • Z. Wilhelmi
    • 8
  • J. Zabierowski
    • 9
  • J. Zlomanczuk
    • 3
  1. 1.Physikalisches Institut der Universität TübingenTübingenGermany
  2. 2.The Svedberg Laboratory UppsalaSweden
  3. 3.Department of Radiation SciencesUppsala UniversityUppsalaSweden
  4. 4.I. Institut für Experimentalphysik der Universität HamburgHamburgGermany
  5. 5.IKP - Forschungszentrum Jülich GmbHJülichGermany
  6. 6.Joint Institute for Nuclear Research DubnaMoscowRussia
  7. 7.Soltan Institute for Nuclear StudiesWarsawPoland
  8. 8.Institute of Experimental PhysicsWarsaw UniversityWarsawPoland
  9. 9.Soltan Institute for Nuclear StudiesLódzPoland

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