Semiclassical Approximation for Non-Abelian Field Strength Correlators in the Instanton Dilute Gas Model
High Energy Physics - Phenomenology
2009-10-30 v3 High Energy Physics - Lattice
Abstract
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.
Keywords
Cite
@article{arxiv.hep-ph/9712523,
title = {Semiclassical Approximation for Non-Abelian Field Strength Correlators in the Instanton Dilute Gas Model},
author = {E. -M. Ilgenfritz and B. V. Martemyanov and S. V. Molodtsov and M. Müller--Preussker and Yu. A. Simonov},
journal= {arXiv preprint arXiv:hep-ph/9712523},
year = {2009}
}
Comments
29 pages (revtex) including 3 figures, revised for publication in Phys. Rev. D