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K¯ photoproduction from protons

  • Regular Article - Hadron Physics
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Abstract.

We study the contribution of the Drell mechanism driven by K+ and K- exchange to the reaction γN → K¯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.

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Authors and Affiliations

  1. Helmholtz-Institut für Strahlen- und Kernphysik (Theorie), Universität Bonn, Nußallee 14-16, D-53115, Bonn, Germany

    A. Sibirtsev, S. Krewald & U. -G. Meißner

  2. Institut für Kernphysik (Theorie), Forschungszentrum Jülich, D-52425, Jülich, Germany

    J. Haidenbauer & U. -G. Meißner

  3. Jefferson Lab, 12000 Jefferson Ave., 23606, Newport News, VA, USA

    A. W. Thomas

Authors
  1. A. Sibirtsev
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  2. J. Haidenbauer
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  3. S. Krewald
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  4. U. -G. Meißner
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  5. A. W. Thomas
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Correspondence to J. Haidenbauer.

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Sibirtsev, A., Haidenbauer, J., Krewald, S. et al. K¯ photoproduction from protons. Eur. Phys. J. A 31, 221–232 (2007). https://doi.org/10.1140/epja/i2006-10216-4

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