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

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

2009-03-29

arxiv.org/abs/0903.5028v1

Phys.Rev.D79:116005,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

31 pages, 11 figures

Scientific paper

10.1103/PhysRevD.79.116005

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

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