Axial current has anomalous divergence ∂_μ j^μ_5 = (e²/16π²) F F̃; explains π⁰ → γγ rate (1/α²); cancels in SM between quarks & leptons.
Axial current has anomalous divergence ∂_μ j^μ_5 = (e²/16π²) F F̃; explains π⁰ → γγ rate (1/α²); cancels in SM between quarks & leptons.