Illuminating hadron structure by scattering light on light

Abstract

The results of an Amplitude Analysis of the world data on integrated and differential cross-sections on $\gamma \gamma \to \pi \pi$ are presented, following the publication of the Belle charged pion results.

Comments: 5 pages, 7 figures. To appear in the Proceedings of the International Workshop on $e^{+}{e}^{-}$ collisions from $\varphi$ to $\psi$, Frascati, April 2008. This version rewords the reference to the work of Achasov and Shestakov, with apologies to them for any misunderstanding