Name: Maksym (email_not_shown)
Date: 08/19/17-08:37:03 PM Z

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By the way, Feynman rules tell me that there must be GS[k1+k2]+mp.

Maybe similar question, but I don't understand why the traces

DiracTrace[ComplexConjugate[QuarkPropagator[{p, m}]]] /.
DiracTrace -> TR // Contract // Simplify
DiracTrace[QuarkPropagator[{p, m}]] /. DiracTrace -> TR //
Contract // Simplify

give similar results (4im/(p^2-m^2)), while they must be different because of the sign.

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