Instanton IR stabilization in the nonperturbative confining vacuum | Zendy

N. O. Agasian | Zendy; Sergei M. Fedorov | Zendy

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Instanton IR stabilization in the nonperturbative confining vacuum

Author(s) -

N. O. Agasian,

Sergei M. Fedorov

Publication year - 2001

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/2001/12/019

Subject(s) - instanton , physics , quantum chromodynamics , qcd vacuum , gluon , quantum fluctuation , effective action , quantum electrodynamics , lattice (music) , gauge theory , quantum , quantum mechanics , mathematical physics , particle physics , lattice qcd , acoustics

The influence of nonperturbative fields on instantons in quantumchromodynamics is studied. Nonperturbative vacuum is described in terms ofnonlocal gauge invariant vacuum averages of gluon field strength. Effectiveaction for instanton is derived in bilocal approximation and it is demonstratedthat stochastic background gluon fields are responsible for infra-red (IR)stabilization of instantons. Dependence of characteristic instanton size ongluon condensate and correlation length in nonperturbative vacuum is found. Itis shown that instanton size in QCD is of order of 0.25 fm. Comparison ofobtained instanton size distribution with lattice data is made.Comment: 10 pages, 4 figures; v2: minor corrections, to appear in JHE

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