The kaon optical potential modified by Θ^+ Pentaquark excitation

Details The kaon optical potential modified by Θ^+ Pentaquark excitation The kaon optical potential modified by Θ^+ Pentaquark excitation

2006-10-27

arxiv.org/abs/hep-ph/0610371v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, 6 figures, to appear in the proceedings of the IV International Conference on Quarks and Nuclear Physics (QNP06), Mad

Scientific paper

We study the kaon nuclear optical potential including the effect of the \Theta^+ pentaquark in a self-consistent approach, starting from an extension of the Juelich meson-exchange potential as bare kaon-nucleon interaction. Significant differences between a fully self-consistent calculation and the low-density T\rho approximation are observed. Whereas te influence of the KN -> \Theta^+ absorption process is found to be negligible, due to the small \Theta^+ KN coupling, the two-nucleon mechanism (KNN -> \Theta^+ N), estimated from the two-meson coupling of the pentaquark, provides the necessary additional kaon absorption to reconcile with data the systematically low theoretical K^+ nucleus reaction cross sections.

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