Pion-pion amplitude from the πN→ππN reaction

Abstract The possibilities of extracting parameters of ππ interaction from the experimental data on the π N→ ππ N reaction are analyzed in detail. The interval 300 P lab c is shown to be the smoothness domain of the π N→ ππ N amplitude. The expression for the background part of the amplitude is developed model-independently. The ππ scattering is described by four parameters to be extracted from experimental data (along with 11 background parameters).