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VOLUME 20 (1974) | ISSUE 11 | PAGE 748
Angular distributions of secondary pions in the reaction π- p → π- π+ n
Results are presented of the analysis of the angular distributions of the secondary pions in the reaction π~ρ—>π~π+η. The asymmetry of the angular distributions in the region of the p° resonance is confirmed and the angualr symmetry function R is calculated. Using the spin density matrix formalism, the experimental data are compared with the predictions of the one-pion exchange (OPE), one-pion exchange with form factor (OPEF), and the absorption (OPEA) models. Good agreement with experiment is obtained with the OPEA model.