Quark-Hadron Duality in Photoabsorption Sum Rules and Two Photon Decays of Meson Resonances

Abstract

The idea of quark-hadron duality is developed and applied to integral sum rules for the photoexcitation of meson resonances. Some applications of the presented approach in the light and heavy quark sectors are made, and the role of the scalar diquark cluster degrees of freedom in the radiative formation of light scalar mesons is discussed.

Comments: 7 pages, Latex, no figures; Talk given at the 2nd International Symposium on the Gerasimov-Drell-Hearn Sum Rule and the Spin Structure of the Nucleon, Genova, Italy, July 3-6, 2002