Analysis of Theta+ production in K+Xe collisions
Abstract
The reaction K+Xe->K0pX is investigated in a meson-exchange model including rescattering of the secondary protons with the aim to analyze the evidence for the Theta+(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->K0p reaction which may contribute to the Theta+(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 Theta+ resonance of both positive and negative parity in comparison with the DIANA data. We show that the K+Xe->K0pX calculations without Theta+ contribution as well as the results obtained with a Theta+ 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.
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