On the dispersion theory of $\pi \pi$ scattering

Abstract

Recent developments in low energy pion physics are reviewed, emphasizing the strength of dispersion theory in this context. As an illustration of the method, I discuss some consequences of the forward dispersion relation obeyed by the isoscalar component of the scattering amplitude.

Contribution to the proceedings of the workshop "Quark Confinement and the Hadron Spectrum VII", Ponta Delgada, Azores Islands, Portugal, September 2006

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