and thanks for your prompt answer. Regarding the use of "." : I guess I was mislead by reading in the documentation page for Contract :
" The "." as multiplication operator is not necessary but just convenient for typesetting.”
Anyways I followed your suggestions but I still get an error message and no result when calling
In:= DiracTrace[AmpF2, DiracTraceEvaluate -> True, West -> True]
During evaluation of In:= DiracTrace::ndranomaly: You are using naive dimensional regularization (NDR), such that in D dimensions gamma^5 anticommutes with all other Dirac matrices. In this scheme (without additional prescriptions) it is not possible to compute traces with an odd number of gamma^5 unambiguously. Evaluation aborted! >>
I have tried to set D->4 before or to use the option West-> True, but no luck so far.
Thanks again for your help,
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