It is shown that a nonlinear Lagrangian model with chiral SU(2)SU(2) symmetry for the π-N system proposed earlier, when complemented with an exact partially conserved axial-vector current term, provides a systematic and unified treatment of various phenomenological Lagrangians that are found in the recent literature. A detailed comparison is made for three special cases, showing agreement with current algebra and experimental data for π-N and π-π scattering lengths.
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Chang et al. (1967) studied this question.
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