An intermediate-coupling method of calculation is applied to the meson-nucleon scattering problem for the case of symmetric pseudoscalar mesons, coupled to a fixed extended source through derivative coupling. It is found that the experimentally observed P-wave phase shifts can be explained by taking the coupling constant f²=0.712 and the cutoff ωₘₐₓ=6.21 meson masses. (This corresponds to a renormalized coupling constant fᵣ²=0.105.)
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Friedman et al. (1955) studied this question.
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