Eta-Eta' mixing and the derivative of the topological susceptibility at zero momentum transfer

Abstract

The couplings of the isosinglet axial-vector currents to the Eta and Eta' mesons are evaluated in a stable, model independent way by use of polynomial kernels in dispersion integrals. The corrections to the Gell-Mann-Oakes-Renner relation in the isoscalar channel are deduced. The derivative of the topological susceptibility at the origin is calculated taking into account instantons and instanton screening.

Mistakes corrected. Text after eq.3.14 changed. An evaluation of the topological susceptibility itself is presented in addition

References in corpus (3)

• Hadronic Z- and tau-Decays in Order alpha_s^4
• The eta transition form factor from space- and time-like experimental data
• Axial and pseudoscalar current correlators and their couplings to eta and etaprime mesons