ar X iv : 0 81 0 . 12 17 v 1 [ he p - ph ] 7 O ct 2 00 8 Dispersive Approach to Abelian Axial Anomaly and η − η ′ Mixing
نویسنده
چکیده
We investigate what can be learnt about the η -η mixing by means of dispersive representation of axial anomaly. We show that our method leads to the strong bounds for the η − η mixing angle: θ = −15.3◦ ± 1. Moreover, our result manifests also a dramatic dependence of the width Γη→2γ on the mixing angle θ. This property explains how the relatively small mixing strongly effects the decay width.
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