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hello,
i have:
Ma=SpinorUBar[k1,m].DiracMatrix[mu].SpinorU[p1,m].SpinorUBar[k2,m].DiracMatrix[mu].SpinorU[p2,m]

Mac=ComplexConjugate[Ma] /.mu->nu

amp=Ma Mac //Contract

amps=FermionSpinSum[amp]

but the output of FermionSpinSum does not has Traces, the above code is for calculating the unpolorized feynman amplitude of the Moller process.
can you help me

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