The quark–gluon mixed condensate calculated via field correlators

AbstractThe quark–gluon mixed condensate g〈q̄σμνFμνq〉 is calculated in the Gaussian approximation of the field correlator method. In the large Nc limit and for zero mass quarks one obtains a simple result, m20≡g〈q̄σμνFμνq〉/〈q̄q〉=16σπ, where σ is the string tension. For a standard value σ=0.18 GeV2 one obtains m20=1 GeV2 in good agreement with the QCD sum rules estimate m20=(0.8±0.2) GeV2 and the latest lattice result m20≅1 GeV2