Semiclassical approximation for non-Abelian field strength correlators in the instanton dilute gas model - art. no. 114508

Field strength correlators are semiclassically evaluated in the dilute gas model of non-Abelian sources (instantons) and compared with lattice data fo r QCD at zero temperature. We show that one of the Euclidean invariant, ten sorial structures vanishes for configurations being purely self-dual or ant i-self-dual. We compute the invariant functions contributing to the correla tors within the two lowest orders in an instanton density expansion. Fittin g instanton size and density for quenched and full QCD, we obtain a reasona ble description. [s0556-2821(98)04719-5].