sorry for the late reply. I'm afraid that with FeynCalc 8.2 the
reordering of Spinors (due to DiracSimplify applying Sirlin's
identitites) cannot be easily disabled.
In FeynCalc 9 and above there is an option SirlinRelations, so that
one could either set
SetOptions[DiracSimplify, SirlinRelations -> False]
or (which is even better) use TID instead of OneLoop.
Am 06.05.2017 um 05:28 schrieb Monica Salinas:
> IŽm using mathematica 8.2.
> I have an expression like this
> But when I introduce this in OneLoop instruction, at the end Mathematica changes the order of the spinors
> How can I avoid this?
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