Name: Joseph (email_not_shown)
Date: 07/06/12-09:05:46 PM Z

I have an expression generated by FeynArts like FermionChain[a,b,...].

when i multiply it by it\\\'s complex conjugate and act upon the result FermionSpinSum command I don\\\'t get the wanted trace expression, just a copy of the input. Any ideas what\\\'s wrong?

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