Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-09-02
Phys.Atom.Nucl. 67 (2004) 376-390; Yad.Fiz. 67 (2004) 394-408
Physics
High Energy Physics
High Energy Physics - Phenomenology
25 pages, 7 figures, 3 tables, RevTeX4, some corrections made and references added
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. Dependence of characteristic instanton size on gluon condensate and correlation length in nonperturbative vacuum is found. Comparison of obtained instanton size distribution with lattice data is made.
Agasian Nikita O.
Fedorov Sergei M.
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