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Study of Gamma + Pi --> Pi + Pi

Tran N. Truong

hep-pharXiv:hep-ph/9903378

Abstract

The problem of Gamma + Pi --> Pi + Pi is studied using the axial anomaly, elastic unitarity, analyticity and crossing symmetry. Single variable dispersion relation is assumed. Using elastic unitarity relation, an integral equation equation for the lowest partial wave amplitude is obtained. The solution for this integral equation is obtained by an iteration procedure corresponding to that obtained from the vector meson dominance model but with multiple scattering effects taken into account.

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