Instanton infra-red stabilization in the nonperturbative QCD vacuum

Details Instanton infra-red stabilization in the nonperturbative QCD vacuum Instanton infra-red stabilization in the nonperturbative QCD vacuum

2002-11-10

arxiv.org/abs/hep-ph/0211139v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, 2 figures. Talk given at 5th International Conference on Quark Confinement and the Hadron Spectrum, Gargnano, Brescia

Scientific paper

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. Comparison of obtained instanton size distribution with lattice data is made.

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