The kaon optical potential modified by \Theta^+ Pentaquark excitation
Abstract
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.
Keywords
Cite
@article{arxiv.hep-ph/0610371,
title = {The kaon optical potential modified by \Theta^+ Pentaquark excitation},
author = {D. Cabrera and L. Tolos and A. Ramos and A. Polls},
journal= {arXiv preprint arXiv:hep-ph/0610371},
year = {2007}
}
Comments
3 pages, 6 figures, to appear in the proceedings of the IV International Conference on Quarks and Nuclear Physics (QNP06), Madrid, Spain, June 5-10, 2006