Virtualities of Quarks and Gluons in QCD Vacuum and Nonlocal Condensates within Single Instanton Approximation

Details Virtualities of Quarks and Gluons in QCD Vacuum and Nonlocal Condensates within Single Instanton Approximation Virtualities of Quarks and Gluons in QCD Vacuum and Nonlocal Condensates within Single Instanton Approximation

1997-02-25

arxiv.org/abs/hep-ph/9702417v2

Phys.Rev. D56 (1997) 4062-4068

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, LATEX, no figures. Revised version contains two formulae corrected and references updated

Scientific paper

10.1103/PhysRevD.56.4062

We calculate the lowest-dimensional nonlocal quark and gluon condensates within the single instanton approximation of the instanton liquid model. As a result, we determine the values of average virtualities of quarks $\lambda_q^2$ and gluons $\lambda_g^2$ in the QCD vacuum and obtain parameterless predictions for the ratio $\lambda_g^2/\lambda_q^2 = 12/5$, and for some ratios of different vacuum condensates of higher dimensions. The nonlocal properties of quark and gluon condensates are analyzed, and insufficiency of the single instanton approximation is discussed.

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