Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-05-02
Phys.Rev.Lett. 91 (2003) 022004
Physics
High Energy Physics
High Energy Physics - Phenomenology
The way to present Eqs. (2), (4), (7) are changed while physics contents and calculations are left intact; Additional explanat
Scientific paper
10.1103/PhysRevLett.91.022004
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 $\gamma p\to \pi^+ n$.
Close Frank E.
Zhao Qiang
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