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Pions, or pi mesons, are particles that consist of a quark and an antiquark of either up or down flavour. The exchange of virtual pions provides an explanation for the residual strong force between nucleons.
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Chiral anomaly and decay of the pion
Neutral Pion would not decay (in Your discussed case) only if the constituent quarks forming the neutral pion were massless. The professional answer to Your question can be found here:
http://www.scho …