The η′ meson is associated with the U(1) anomaly. In this paper, a successful effective chiral theory of mesons has been applied to study the anomalous decays of η′ → π+π−π+(0)π−(0). Contribution of triangle and box diagrams is calculated, which indicates that the box anomaly has a significant contribution to the decay amplitudes.
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Jafari, Ehsan and Li, Bing An, "Theoretical Study on η′ → π+π−π+(0)π−(0)" (2021). Physics and Astronomy Faculty Publications. 676.