Energy dependence of the Λ/Σproduction cross-section ratio in p-p interactions

  • P. Kowina
  • M. Wolke
  • H. -H. Adam
  • A. Budzanowski
  • R. Czyżykiewicz
  • D. Grzonka
  • J. Haidenbauer
  • M. Janusz
  • L. Jarczyk
  • A. Khoukaz
  • K. Kilian
  • P. Moskal
  • W. Oelert
  • C. Piskor-Ignatowicz
  • J. Przerwa
  • C. Quentmeier
  • T. Rożek
  • R. Santo
  • G. Schepers
  • T. Sefzick
  • M. Siemaszko
  • J. Smyrski
  • S. Steltenkamp
  • A. Strzałkowski
  • P. Winter
  • P. Wüstner
  • W. Zipper
Article

Abstract.

The production of the Λ- and Σ0-hyperons has been measured via the pppK+Λ/Σ0 reaction at the internal COSY-11 facility in the excess energy range between 14 and 60 MeV. The transition of the Λ/Σ0 cross-section ratio from about 28 at Q≤13 MeV to the high-energy level of about 2.5 is covered by the data showing a strong decrease of the ratio between 10 and 20 MeV excess energy. Effects from the final-state interactions in the p0 channel seem to be much smaller than in the p-Λ channel. Estimates of the effective range parameters are given for the NΛ and the NΣ systems.

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2004

Authors and Affiliations

  • P. Kowina
    • 1
    • 5
  • M. Wolke
    • 1
  • H. -H. Adam
    • 2
  • A. Budzanowski
    • 3
  • R. Czyżykiewicz
    • 4
  • D. Grzonka
    • 1
  • J. Haidenbauer
    • 1
  • M. Janusz
    • 4
  • L. Jarczyk
    • 4
  • A. Khoukaz
    • 2
  • K. Kilian
    • 1
  • P. Moskal
    • 1
    • 4
  • W. Oelert
    • 1
  • C. Piskor-Ignatowicz
    • 4
  • J. Przerwa
    • 4
  • C. Quentmeier
    • 2
  • T. Rożek
    • 5
  • R. Santo
    • 2
  • G. Schepers
    • 1
  • T. Sefzick
    • 1
  • M. Siemaszko
    • 5
  • J. Smyrski
    • 4
  • S. Steltenkamp
    • 2
  • A. Strzałkowski
    • 4
  • P. Winter
    • 1
  • P. Wüstner
    • 6
  • W. Zipper
    • 5
  1. 1.Institut für KernphysikForschungszentrum JülichJülichGermany
  2. 2.Institut für KernphysikWestfälische Wilhelms-UniversitätMünsterGermany
  3. 3.Institute of Nuclear PhysicsCracowPoland
  4. 4.Institute of PhysicsJagellonian UniversityCracowPoland
  5. 5.Institute of PhysicsUniversity of SilesiaKatowicePoland
  6. 6.Zentrallabor für ElektronikForschungszentrum JülichJülichGermany

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