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HiÈبplease do something like¨Ø¨aØSpinor¸p4Èm4Ø.DiracMatrix¸5Ø.Spinor¸p2Èm2Ø.بFourVector¸2*p3-2*p1ÈmuØببca Ø ComplexConjugate¸aØ ø. mu -è nuبببFactor2¸Contract¸FermionSpinSum¸a*caØ*ب PolarizationSum¸muÈ nuÈ p1ØØ ø. ب DiracTrace ¨è ˆTr¸Calc¸81ØØ h ˜ØببˆI used to have a construct (ComplexIndex(È but I think بFrederik talked me out of it ...˜.ببRegardsÈ and sorry for the late answerÈببRolf Mertig

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