Locality of quark-hadron duality and deviations from quark counting rules above the resonance region.
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. The essential principles are illustrated in a pedagogic model of a composite system with two spinless charged constituents, for which a dual picture for the low-energy resonance phenomena and high-energy scaling behavior can be established. We introduce the concept of "restricted locality" of quark-hadron duality and show how this results in deviations from the perturbative quantum chromodynamics quark counting rules above the resonance region. In particular, it can be a possible source for oscillations about the smooth quark counting rule, as seen, e.g., in the 90-degree differential cross sections for gammap-->pi(+)n.
Zhao
Qiang
Q
Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom. Qiang.Zhao@surrey.ac.uk
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Frank E
FE