Abstract
Partial wave dispersion relations are used to investigate low-energy s-wave pion-nucleon scattering. The various terms in the relations are examined. It is shown that the Born terms are very small, and the remaining terms are of the same order of magnitude as the observed scattering amplitudes. The evidence for a low-energy pion-pion interaction from s-wave pion-nucleon scattering is examined. A comparison of the dispersion relations, for s- and p-wave partial amplitudes, is made.
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