Diagrammatic decomposition of two-pion intermediate states contributing to hadronic-light-by-light scattering.

From the article:

Rescattering Effects in the Hadronic-Light-by-Light Contribution to the Anomalous Magnetic Moment of the Muon
Gilberto Colangelo, Martin Hoferichter, Massimiliano Procura, and Peter Stoffer
Phys. Rev. Lett. 118, 232001 (2017)

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