## Neutral pions

So apparently a neutral pion is a superposition of $u\bar{u}$ and $d\bar{d}$. I'm having trouble understanding what this means. I have no problem understanding how the decay products of some scattering experiment could be a superposition of these two states, but how can we treat this superposition as a single particle? And how would you draw the feynman diagram for some process involving a neutral pion?

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 Recognitions: Homework Help The neutral pions are decay products from scattering. There are plenty of examples online of Feynman diagrams involving pions.
 the decay of neutral pions into two photons happens through the anomaly in divergence of axial vector current.the decay has a triangle diagram. http://prola.aps.org/abstract/PR/v177/i5/p2426_1 it is available freely here. http://astrophysics.fic.uni.lodz.pl/...pdf/12/068.pdf