X iv : n uc l - th / 9 60 30 31 v 1 2 1 M ar 1 99 6 Sidewise dispersion relations and the structure of the nucleon vertex
نویسندگان
چکیده
We revisit sidewise dispersion relations as a method to relate the nu-cleon off-shell form factor to observable quantities, namely the meson-nucleon scattering phase shifts. It is shown how for meson-nucleon scattering a re-definition of the intermediate fields leaves the scattering amplitude invariant, but changes the behavior of the off-shell form factor as expressed through dispersion relations, thus showing representation dependence. We also employ a coupled-channel unitary model to test the validity of approximations concerning the influence of inelastic channels in the sidewise dispersion relation method.
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