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Two photon transition form factors of neutral pseudoscalar mesons

Minghui Ding, Daniele Binosi, Khépani Raya, Lei Chang, Craig D. Roberts
Starting from the axial vector Ward-Green-Takahashi identity, and the necessity of preserving this identity when attempting to calculate the properties describing pseudoscalar mesons, we describe a Bethe-Salpeter kernel which takes into account the non-Abelian anomaly and therefore is suitable to describe the flavor mixing states η,η′. We then report results for the two photon transition form factors of η,η′, and compare them with existing experimental data.