Pion-nucleon scattering lengths have been calculated using a model in which N, N*, ρ, and ε exchanges are assumed to dominate the low-energy pion-nucleon interaction. This simple model yields remarkably good agreement with the experimental s- and p-wave scattering lengths. We find that the coupling of the ε meson to the nucleon is consistent with estimates made using chiral symmetry and current algebra.
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Dutta-Roy et al. (1969) studied this question.
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