Theoretical Aspects of the Pion-Pion Interaction

Abstract

We give a brief review of the theoretical description of low energy pion-pion scattering by the combined use of Chiral Perturbation Theory and Roy equations, an update of the Regge parametrization of $\ddot{I}€\ddot{I}€$ cross sections at high energies, and a short discussion of the scalar radius of the pion.

4 pages, talk presented by I. Caprini at the International Conference on QCD and Hadronic Physics, June 16-20 2005, Beijing