The Correlator of Topological Charge Densities at low $Q^2$ in QCD

Details The Correlator of Topological Charge Densities at low $Q^2$ in QCD The Correlator of Topological Charge Densities at low $Q^2$ in QCD

1998-11-02

arxiv.org/abs/hep-ph/9811217v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 p., no figures, Revtex

Scientific paper

The correlator of topological charge densities $\chi(Q^2)$ in QCD is calculated in the domain of low $Q^2$. Basing on the Ward identities the low energy theorems are proved. The value of the first derivative $\chi^{\prime}(0)$ found recently by QCD sum rules \cite{1} is used. The contributions of pseudoscalar quasi-Goldstone bosons as intermediate states in the correlator are calculated with the account of $\eta-\pi$ mixing.

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