Abstract

K-nucleon scattering is assumed to be due to the set of processes shown in Fig. 1, in which intermediate states constisting of the vector meson resonances play important roles. These processes are evaluated using straightforward perturbation methods. Comparing the results with the experimental data available for both I=1 andI = 0 isotopic spin states it is found that the only combination of parities of hyperons for which agreement with experiment is possible is that given by P(AKN) = = P(ΣKN)= -1, the coupling constants being g Λ 2 ≃5 and g Σ 2 ≃2.3. The two-pion isovector resonance is found to give negligible contribution to the scattering, while the exchange of the three-pion isoscalar resonance plays an important role. The contributions of the fourth-order diagrams involving the K* resonance to the scattering in both isotopic spin states are strong and attractive.

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