Semiclassical Approximation for Non-Abelian Field Strength Correlators in the Instanton Dilute Gas Model

Details Semiclassical Approximation for Non-Abelian Field Strength Correlators in the Instanton Dilute Gas Model Semiclassical Approximation for Non-Abelian Field Strength Correlators in the Instanton Dilute Gas Model

1997-12-26

arxiv.org/abs/hep-ph/9712523v3

Phys.Rev. D58 (1998) 114508

Physics

High Energy Physics

High Energy Physics - Phenomenology

29 pages (revtex) including 3 figures, revised for publication in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.58.114508

Field strength correlators are semi-classically evaluated in the dilute gas model of non-Abelian sources (instantons) and compared with lattice data for QCD at zero temperature. We show that one of the Euclidean invariant, tensorial structures vanishes for configurations being purely selfdual or anti-selfdual. We compute the invariant functions contributing to the correlators within the two lowest orders in an instanton density expansion. Fitting instanton size and density for quenched and full QCD, we obtain a reasonable description.

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