Exclusive two-photon annihilation at large energy or large virtuality

Abstract

I review recent progress in the theory of gamma gamma annihilation into meson or baryon pairs at large energy, and of the process gamma* gamma* -> pi0 at large photon virtuality.

Comments: 6 pages, 4 figures. Presented at PHOTON 2003, Frascati, Italy, 7-11 April 2003