Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-12-09
Prog.Part.Nucl.Phys. 52 (2004) 299-376
Physics
High Energy Physics
High Energy Physics - Phenomenology
now 68 pages, 29 figures (1 figure added), habilitation thesis, mild restructuring, typos corrected, about 30 references and c
Scientific paper
10.1016/j.ppnp.2004.02.003
We review the status of the practical operator product expansion (OPE), when applied to two-point correlators of QCD currents which interpolate to mesonic resonances, in view of the violations of local quark-hadron duality. Covered topics are: a mini-review of mesonic QCD sum rules in vacuum, at finite temperature, or at finite baryon density, a comparison of model calculations of current-current correlation functions in 2D and 4D with the OPE expression, a discussion of meson distribution amplitudes in the light of nonperturbatively nonlocal modifications of the OPE, and a reorganization of the OPE which (partially) resums powers of covariant derivatives.
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