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I have a short question. I think everybody knows the Furry theorem for QED, which tells, in particular, that fermion loops with odd number of fermions always give 0.

Does the same true for QCD of weak theory? Can one have non-zero contribution to 3-gluon vertex (or 3-boson vertex) from 3-quark (3-lepton) loop with strong (weak) vertices.

Thanks,

Ivan

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# Furry theorem

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