· FeynCalc

Name: Vladyslav Shtabovenko Date: 07/10/16-06:33:26 PM Z

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Hi Francesco,

indeed, thanks for your feedback. The Feynarts’ ScalarProduct seems to
appear only in generated models but not in the standard ones like
SM.mod. I added it to the conversion function, so it should work now

<https://github.com/FeynCalc/feyncalc/commit/16671c927576bbdd75c82b941808538fc5f194b4>

Cheers,
Vladyslav

Am 10.07.2016 um 12:43 schrieb Francsco:
> Hi Vladyslav,
> thank you for yours suggestions.
>
> I implemented 8-dimensional operator with 4 fermions and 2 derivatives (via an auxiliary field). Everything seems work well expect when I have to convert the amplitude.
> This time, there are some momentum on the numerator and I think that the FCFAConvert function doesn’t convert properly the scalar products. In fact, I get some terms like (-k1).(k1 - p2) which is different form -Pair[Momentum[k1], Momentum[k1 - p2]]. With this last expression, I can simplify my expression using ExpandScalarProduct and using Mandelstam variables.
>
> As usual, you find my model and the notebook here https://www.dropbox.com/sh/hm77oyedcb3p055/AABzBlEPZvcPjAstjoclCR3ya?dl=0
>

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