Abstract

A considerable part in the interpretation of pi -N reactions can be made independently of the details of meson field theory. Such part is discussed, separating the dynamical effects of pi -N interactions. A historical survey on this approach is given for the purpose of elucidating a trend of activities in Japan. Both the angular distributions of pions and the polarizations of recoil nucleons are calculated for pi -N scattering and photopion production. The relations between the two reactions were investigated by using the unitarity of the S-matrix. The possible violation of charge independence expected at low energies is discussed. Although the effects of charge dependent interactions are small, ex cept for Coulomb interference, estimates may facilitate the analysis of more accurate experiments. (auth)

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