Dispersive Approach to Abelian Axial Anomaly and $\eta -{\eta }^{\prime }$ Mixing

Y. N. Klopot, A. G. Oganesian, O. V. Teryaev

We investigate what can be learnt about the $\eta$ -${\eta }^{\prime }$ mixing by means of dispersive representation of axial anomaly. We show that our method leads to the strong bounds for the $η-η…