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The European Physical Journal A

, Volume 31, Issue 2, pp 221–232 | Cite as

K¯ photoproduction from protons

  • A. Sibirtsev
  • J. HaidenbauerEmail author
  • S. Krewald
  • U. -G. Meißner
  • A. W. Thomas
Regular Article - Hadron Physics

Abstract.

We study the contribution of the Drell mechanism driven by K+ and K- exchange to the reaction γNK¯N. Our calculation implements the full KN and ¯N reaction amplitudes in the form of partial-wave amplitudes taken from a meson-exchange model (KN) and a partial-wave analysis (¯N), respectively. Comparing our results to data of the LAMP2 Collaboration we observe that the Drell mechanism alone cannot describe the large Λ(1520) photoproduction rate observed experimentally. We argue that the discrepancy could be due to significant contributions from K * meson exchange with subsequent excitation of the Λ(1520)-resonance. After adding such contributions to our model a good agreement of the LAMP2 experiment is achieved. When applying the same model to the recent SAPHIR data we find an excellent description of the K+ p spectrum and find indications for a hyperon resonance with M R = 1617MeV and ΓR = 117MeV in the K- p mass distribution.

PACS.

12.40.Nn Regge theory, duality, absorptive/optical models 13.60.Le Meson production 13.60.Rj Baryon production 13.75.Jz Kaon-baryon interactions 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2007

Authors and Affiliations

  • A. Sibirtsev
    • 1
  • J. Haidenbauer
    • 2
    Email author
  • S. Krewald
    • 1
  • U. -G. Meißner
    • 1
    • 2
  • A. W. Thomas
    • 3
  1. 1.Helmholtz-Institut für Strahlen- und Kernphysik (Theorie)Universität BonnBonnGermany
  2. 2.Institut für Kernphysik (Theorie)Forschungszentrum JülichJülichGermany
  3. 3.Jefferson LabNewport NewsUSA

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