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

Journal article

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.

Authors: Zhao, Q; Close, F

• Publication status: Published
• Journal: Physical Review Letters
• Volume: 91
• Issue: 2
• Pages: 022004
• Publication date: 2003-07-01
• DOI: 10.1103/physrevlett.91.022004
• EISSN: 1079-7114
• ISSN: 0031-9007
• Language: English