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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 polynomialkernels in dispersion integrals. The corrections to the Gell-Mann-Oakes-Rennerrelation in the isoscalar channel are deduced. The derivative of thetopological susceptibility at the origin is calculated taking into accountinstantons and instanton screening.

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