Abstract
The theoretical analysis for the threshold pion production has been performed by using the models of heavy-meson exchange and pion-rescattering including the effect of nucleon resonances. The experimental data of the π− production support the relative sign between the s-wave and p-wave pion-production amplitudes which is given by these models. The d-wave pion production amplitude is discussed about the angular distribution of π0 production. The spin correlation observables give information about the partial wave amplitudes.
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