Chiral anomaly + EFT (Wess-Zumino-Witten)

Layer 1 — Physicsin the Effective Field Theory subtree

Bardeen 1969 chiral anomaly survives in low-energy ChPT as Wess-Zumino-Witten term: integer-coefficient gauge-invariant 5D term descending to 4D pi-K-eta vertices; explains pi0 -> 2 gamma rate.

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