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Scalar-isovector K¯ production close to threshold

  • A. Dzyuba
  • V. Kleber
  • M. Büscher
  • V. P. Chernyshev
  • S. Dymov
  • P. Fedorets
  • V. Grishina
  • C. Hanhart
  • M. Hartmann
  • V. Hejny
  • L. Kondratyuk
  • V. Koptev
  • P. Kulessa
  • Y. Maeda
  • T. Mersmann
  • S. Mikirtychyants
  • M. Nekipelov
  • D. Prasuhn
  • R. Schleichert
  • A. Sibirtsev
  • H. J. Stein
  • H. Ströher
  • I. Zychor
Hadron Physics

Abstract.

The reaction ppdK +¯ has been investigated at excess energies Q = 47.4 and 104.7MeV above the K +¯ threshold at COSY Jülich. Coincident dK+ pairs were detected with the ANKE spectrometer, and subsequently ∼ 2000 events with a missing ¯ invariant mass were identified, which fully populate the Dalitz plot. The joint analysis of invariant mass and angular distributions reveals s-wave dominance between the two kaons, in conjunction with a p-wave between the deuteron and the kaon pair, i.e. K¯ production via the a 0 +(980) channel. Integration of the differential distributions yields total cross-sections of σ(ppdK +¯) = (38±2stat±14syst)nb and (190±4stat±39syst)nb for the low and high Q value, respectively.

PACS.

25.10.+s Nuclear reactions involving few-nucleon systems 13.75.-n Hadron-induced low- and intermediate-energy reactions and scattering (energy ⩽ 10GeV) 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2006

Authors and Affiliations

  • A. Dzyuba
    • 1
    • 2
  • V. Kleber
    • 3
  • M. Büscher
    • 2
  • V. P. Chernyshev
    • 4
  • S. Dymov
    • 5
  • P. Fedorets
    • 2
    • 4
  • V. Grishina
    • 6
  • C. Hanhart
    • 2
  • M. Hartmann
    • 2
  • V. Hejny
    • 2
  • L. Kondratyuk
    • 5
  • V. Koptev
    • 1
  • P. Kulessa
    • 7
  • Y. Maeda
    • 2
    • 3
  • T. Mersmann
    • 8
  • S. Mikirtychyants
    • 1
  • M. Nekipelov
    • 1
    • 2
  • D. Prasuhn
    • 2
  • R. Schleichert
    • 2
  • A. Sibirtsev
    • 2
    • 9
  • H. J. Stein
    • 2
  • H. Ströher
    • 2
  • I. Zychor
    • 10
  1. 1.High Energy Physics DepartmentPetersburg Nuclear Physics InstituteGatchinaRussia
  2. 2.Institut für KernphysikForschungszentrum JülichJülichGermany
  3. 3.Institut für KernphysikUniversität zu KölnKölnGermany
  4. 4.Institute for Theoretical and Experimental PhysicsMoscowRussia
  5. 5.Laboratory of Nuclear ProblemsJoint Institute for Nuclear ResearchDubnaRussia
  6. 6.Institute for Nuclear ResearchMoscowRussia
  7. 7.Institute of Nuclear PhysicsCracowPoland
  8. 8.Institut für KernphysikUniversität MünsterMünsterGermany
  9. 9.Helmholtz-Institut für Strahlen- und Kernphysik (Theorie)Universität BonnBonnGermany
  10. 10.The Andrzej Sołtan Institute for Nuclear StudiesŚwierkPoland

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