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

Abstract

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.

arXiv comment31 pages, 11 figures

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Cited by in corpus (5)

• Eta-nucleon coupling constant in QCD with SU(3) symmetry breaking
• Quark distributions and gluon contents of eta and etaprime
• Sub-leading power corrections to transition form factors of $\eta$ and ${\eta }^{\prime }$ mesons from twist-six contributions
• Eta-Eta' mixing and the derivative of the topological susceptibility at zero momentum transfer
• An analysis of B meson decays to two light pseudoscalar nonets with deltaS=1 in QCD factorization approach