Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-02-25
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.
Dorokhov Alexander E.
Esaibegyan S. V.
Mikhailov S. V.
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