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Hi,

since FeynCalc by itself does not generate any amplitudes, the overall sign
completely depends on what you give it as an input expression.

For FeynArts input the sign depends on the model

https://github.com/FeynCalc/feyncalc/wiki/FAQ#fasigns

Cheers,
Vladyslav

Am 07.08.19 um 01:17 schrieb ythang:
> Hi,
>
> I have a very stupid question... what is the convention used by FeynCalc to compute amplitudes? Obviously, the amplitude does not depend on the signature of the metric. What about instead the overall sign? Is the amplitude defined as in Schwartz's QFT book (see Eq.(24.7) ) ? Thanks.
>

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