Simple description of [Formula presented] scattering to 1 GeV

Motivated by the [Formula presented] expansion, we present a simple model of [Formula presented] scattering as a sum of a current-algebra contact term and resonant pole exchanges. The model preserves crossing symmetry as well as unitarity up to 1.2 GeV. Key features include chiral dynamics, vector meson dominance, a broad low energy scalar ([Formula presented]) meson, and a Ramsauer-Townsend mechanism for the understanding of the 980 MeV region. We discuss in detail the regularization (corresponding to rescattering effects) necessary to make all these nice features work. © 1996 The American Physical Society