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arXiv · hep-ph/0305017

Locality of quark-hadron duality and deviations from quark counting rules above resonance region

Qiang Zhao·Frank E. Close
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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. 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 pQCD 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 $γp\to π^+ n$.

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Qiang Zhao, Frank E. Close. 2003-05-28. Locality of quark-hadron duality and deviations from quark counting rules above resonance region. https://doi.org/10.1103/physrevlett.91.022004

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