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Quick question. If particles that mediate interactions are called gauge bosons, why isn't Pion considered a gauge boson. I'm pretty sure I've come across a few interactions mediated by it.
Just realised that the pion is a meson. So I assume now that the two aren't mutually exclusive. I.e. a meson can also be a boson, or at least a goldstone boson.
If I remember correctly, pions are the pseudo-goldstone bosons when chiral symmetry is broken.
I am sure I do not remember it correctly, but it seemed to me that pions were the gauge bosons of the isotopic symmetry group (Yang-Mills fields).
Bob_for_short.