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Associated strangeness production at threshold

  • P. KowinaEmail author
  • M. Wolke
  • H.-H. Adam
  • A. Budzanowski
  • R. Czyzykiewicz
  • D. Grzonka
  • M. Janusz
  • L. Jarczyk
  • B. Kamys
  • A. Khoukaz
  • K. Kilian
  • T. Lister
  • P. Moskal
  • W. Oelert
  • T. Rozek
  • R. Santo
  • G. Schepers
  • T. Sefzick
  • M. Siemaszko
  • J. Smyrski
  • S. Steltenkamp
  • A. Strzalkowski
  • P. Winter
  • P. Wüstner
  • W. Zipper
Article

Abstract.

The associated strangeness dissociation at threshold has been studied at the COSY-11 facility measuring the hyperon and the K + K - meson pair production. Measurements of the near-threshold \(\Lambda\) and \(\Sigma^0\) production via the \(pp \rightarrow p K^ + \Lambda/\Sigma^0\) reaction (S. Sewerinet al., Phys. Rev. Lett. 83, 682 (1999)) at COSY-11 have shown that the \(\Lambda/\Sigma^0\) cross-section ratio exceeds the value at high excess energies (\(Q\ge 300\) MeV (A. Baldiniet al., Total Cross-Sections for Reactions of High-Energy Particles, Landolt-Börnstein, New Series, Vol. I/12 (Springer, Berlin, 1988))) by an order of magnitude. For a better understanding additional data have been taken between 13 MeV and 60 MeV excess energy. The near-threshold production of the charged kaon-antikaon pair is related to the discussion about the nature of the scalar states in the 1 GeV/c 2 mass range, i.e. the f 0(980) and a 0(980) (O. Krehl, R. Rapp, J. Speth, Phys. Lett. B 390, 23 (1997)). The interpretation as a \(K \overline{K}\) molecule is strongly dependent on the K-\(\overline{K}\) interaction which can be studied via the production channel. A first total cross-section value on the reaction \(pp \rightarrow pp K^ + K^-\) at an excess energy of 17 MeV (C. Quentmeieret al., Phys. Lett. B 515, 276 (2001)), i.e. below the \(\phi\) production threshold, was measured.

Keywords

Additional Data Mass Range Pair Production Excess Energy Scalar State 
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

  • P. Kowina
    • 1
    • 2
    Email author
  • M. Wolke
    • 1
  • H.-H. Adam
    • 3
  • A. Budzanowski
    • 5
  • R. Czyzykiewicz
    • 4
  • D. Grzonka
    • 1
  • M. Janusz
    • 4
  • L. Jarczyk
    • 4
  • B. Kamys
    • 4
  • A. Khoukaz
    • 3
  • K. Kilian
    • 1
  • T. Lister
    • 3
  • P. Moskal
    • 1
    • 4
  • W. Oelert
    • 1
  • T. Rozek
    • 1
    • 2
  • R. Santo
    • 3
  • G. Schepers
    • 1
  • T. Sefzick
    • 1
  • M. Siemaszko
    • 2
  • J. Smyrski
    • 4
  • S. Steltenkamp
    • 3
  • A. Strzalkowski
    • 4
  • P. Winter
    • 1
  • P. Wüstner
    • 6
  • W. Zipper
    • 2
  1. 1.IKPForschungszentrum JülichJülichGermany
  2. 2.Institute of PhysicsUniversity of SilesiaKatowicePoland
  3. 3.IKPMünsterGermany
  4. 4.Institute of PhysicsJagellonian UniversityKrakówPoland
  5. 5.Institute of Nuclear PhysicsKrakówPoland
  6. 6.ZELForschungszentrum JülichJülichGermany

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