Quark-hadron duality in electron scattering

Details Quark-hadron duality in electron scattering Quark-hadron duality in electron scattering

2005-01-24

arxiv.org/abs/hep-ph/0501217v2

Phys.Rept. 406 (2005) 127-301

Physics

High Energy Physics

High Energy Physics - Phenomenology

198 pages, 80 figures, to appear in Physics Reports

Scientific paper

10.1016/j.physrep.2004.10.004

The duality between partonic and hadronic descriptions of physical phenomena is one of the most remarkable features of strong interaction physics. A classic example of this is in electron-nucleon scattering, in which low-energy cross sections, when averaged over appropriate energy intervals, are found to exhibit the scaling behavior expected from perturbative QCD. We present a comprehensive review of data on structure functions in the resonance region, from which the global and local aspects of duality are quantified, including its flavor, spin and nuclear medium dependence. To interpret the experimental findings, we discuss various theoretical approaches which have been developed to understand the microscopic origins of quark-hadron duality in QCD. Examples from other reactions are used to place duality in a broader context, and future experimental and theoretical challenges are identified.

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