With vector-meson effects included, the WZW anomalous coupling extracted from eta-prime to pi+ pi- gamma matches theory and implies a box-anomaly branching fraction about an order of magnitude larger than the published value.
Weinberg, Physica A 96, no.1-2, 327-340 (1979)
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Identify hadron anomalous couplings at colliders
With vector-meson effects included, the WZW anomalous coupling extracted from eta-prime to pi+ pi- gamma matches theory and implies a box-anomaly branching fraction about an order of magnitude larger than the published value.