Name: Vladyslav Shtabovenko Date: 02/16/15-04:00:44 PM Z

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• Maybe in reply to: Joseph: “FermionSpinSum[Fermionchain[]]”

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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.

Cheers,
Vladyslav

> 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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• Next message: Lingxiao Xu: “Can Feynman rules be generated automatically?”
• Previous message: Vladyslav Shtabovenko: “Re: Simplest examples?”
• Maybe in reply to: Joseph: “FermionSpinSum[Fermionchain[]]”

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