PION PARAMETERS FROM HIGH-ENERGY INELASTIC INTERACTIONS

The physical principle that a transition amplitude has a pole for real one-particle intermediate states was employed to study the photoproduction of secondary beams of high-energy particles. Photons were found to be very effective in initiating collimated beams of some very highenergy strongly interacting particles. The "polology" considerations are applied to further experiments in order to check their quantitative content, as well as to determine parameters of interest in pion physics such as the strengths of the ( pi pi pi pi ), ( gamma pi pi pi ), and ( pi pi kappa kappa ) interactions. A straig htforward extension is proposed to different inelastic processes in the work of Chew and Low. The main point is illustrated by comparing the diagrams for the one-pion contribution to elastic and inelastic nucleon-nucleon scattering. (B.O.G.)