Dispersive approach to the axial anomaly,the t'Hooft's principle and QCD sum rules

The dispersive approach to the axial anomaly is revisited. Considering the familiar VVA triangle graph, the anomalous Ward identity is proved in the case of the external momenta corresponding to one real and one virtual photon. We also comment on a recent claim that the anomaly pole in QCD fails to reproduce the pion pole. In this connection, it is emphasized that there is no need to introduce a massless axial meson in the chiral limit. In the framework of QCD sum rules method a constraint for the Borel transform of relevant form factors imposed by the anomaly is considered.