Instanton IR stabilization in the nonperturbative confining vacuum
High Energy Physics - Phenomenology
2010-02-03 v2 High Energy Physics - Lattice
High Energy Physics - Theory
Abstract
The influence of nonperturbative fields on instantons in quantum chromodynamics is studied. Nonperturbative vacuum is described in terms of nonlocal gauge invariant vacuum averages of gluon field strength. Effective action for instanton is derived in bilocal approximation and it is demonstrated that stochastic background gluon fields are responsible for infra-red (IR) stabilization of instantons. Dependence of characteristic instanton size on gluon condensate and correlation length in nonperturbative vacuum is found. It is shown that instanton size in QCD is of order of 0.25 fm. Comparison of obtained instanton size distribution with lattice data is made.
Keywords
Cite
@article{arxiv.hep-ph/0111208,
title = {Instanton IR stabilization in the nonperturbative confining vacuum},
author = {N. O. Agasian and S. M. Fedorov},
journal= {arXiv preprint arXiv:hep-ph/0111208},
year = {2010}
}
Comments
10 pages, 4 figures; v2: minor corrections, to appear in JHEP