RECENT RESULTS ON PION-PION INTERACTIONS OBTAINED FROM PION PRODUCTION EXPERIMENTS

The theoretical methods used to extract ππ phase shifts from inelastic πN scattering experiments are presented in detail. A critical review of the major analyses which study ππ interactions in the ρ{variant} region is given. The specific points on which the various methods differ, as well as the theoretical assumptions which are common to all, are presented. Finally, an attempt is made to extract from all experiments a consistent set of S-wave phase shifts in the region 600 MeV to 1000 MeV. © 1969.