Analysis of Θproduction in K+- Xe collisions
Institut für Kernphysik (Theorie), Forschungszentrum Jülich, D-52425, Jülich, Germany
2 Helmholtz-Institut für Strahlen- und Kernphysik (Theorie), Universität Bonn, Nußallee 14-16, D-53115, Bonn, Germany
Accepted: 3 November 2004
Published online: 17 January 2005
The reaction K +Xe↦K 0 pX is investigated in a meson-exchange model including rescattering of the secondary protons with the aim to analyze the evidence for the Θ+(1540)-resonance reported by the DIANA Collaboration. We confirm that the kinematical cuts introduced by the DIANA Collaboration efficiently suppress the background to the K + n↦K 0 p reaction which may contribute to the Θ+(1540) production. We find that these kinematical cuts do not produce a narrow structure in the K0p effective-mass spectra near 1540 MeV. We study the effect of a narrow Θ+-resonance of both positive and negative parity in comparison with the DIANA data. We show that the K +Xe↦K 0 pX calculations without Θ+ contribution as well as the results obtained with a Θ+ width of 1 MeV are in comparably good agreement with the DIANA results. More dedicated experiments are called for to establish this exotic baryon resonance.
PACS: 11.80.-m Relativistic scattering theory – / 13.60.Le Meson production – / 13.75.Jz Kaon-baryon interactions – / 25.80.Nv Kaon-induced reactions –
© Società Italiana di Fisica and Springer-Verlag, 2005