Restricted locality of quark-hadron duality in exclusive meson photoproduction reactions above the resonance region

Abstract

We show how deviations from the dimensional scaling laws for exclusive processes may be related to a breakdown in the locality of quark-hadron duality, i.e. the "restricted locality". For exclusive reactions like meson photo- and electroproduction above the resonance region, we explore the effects arising from such a local duality breaking and propose that it can be a possible source for oscillations about the smooth quark counting rule predicted by pQCD in the 90-degree differential cross sections.

Comments: Contribution to the 10th International Symposium on Meson-Nucleon Physics and the Structure of the Nucleon (MENU2004), Beijing, 2004; presented by QZ