FermionChain is a FeynArts objects for denoting closed fermion
chains and as such it is not present in FeynCalc. To convert it
to FeynCalc, replace FermionChain by DOT.
> 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?
This archive was generated by hypermail 2b29 : 08/21/18-02:00:01 AM Z CEST