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Springer Science and Business Media LLC Journal of High Energy Physics 2025(7)
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    A bstract The strength of the interaction of three pions and a photon, F 3 π is predicted by the axial anomaly in terms of the pion decay constant, a relation that is frequently used to constrain low-energy radiative processes involving pions, but only tested experimentally at the 10% level. Here, we present a new avenue to test this prediction, via a fit of a dispersive description of the γ ∗ → 3 π amplitude to data for e + e − → 3 π . From the global fit to SND, CMD-2, and BaBar data we obtain F 3 π = 33.1(1.7) GeV −3 , in agreement with the chiral prediction at the level of 5%. We also consider dispersive fits to the recent data by Belle II, in which case we observe tensions with the dispersive constraints, the width parameters of ω and ϕ , and the chiral anomaly.

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