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Correlators of singlet and octet axial currents, as well as anomaly andpseudoscalar densities have been studied using QCD sum rules. Several of thesesum rules are used to determine the couplings f^8_eta, f^0_eta, f^8_etaprimeand f^0_etaprime. We find mutually consistent values which are also inagreement with phenomenological values obtained from data on various decay andproduction rates. While most of the sum rules studied by us are independent ofthe contributions of direct instantons and screening correction, thesinglet-singlet current correlator and the anomaly-anomaly correlator improveby their inclusion.

Axial and pseudoscalar current correlators and their couplings to eta and etaprime mesons