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GaugeXi[Subscript[S[SequenceForm["Gen", 5]]]]

is just a gauge parameter related to the vector bosons in your model.
You can also see it in your test.gen

Cheers,
Vladyslav

Am 19.09.2017 um 19:23 schrieb Francesco:
> My model is the following
>
> File gen https://www.dropbox.com/s/z1xw3yy30dwkvw3/test.gen?dl=0
> File mod https://www.dropbox.com/s/fk945tq7gmf2s0y/test.mod?dl=0
> File pars https://www.dropbox.com/s/0d3i6scls57mwr1/test.pars?dl=0
>
> where there is a real scalar Sk with multiderivative interactions.
>
> When I compute the amplitude for Sk Sk > Sk SK, In the exprssion of the amplitude, I get a strange term which is called "xi" Subscript[S[ SequenceForm["Gen", 5]]. What is it?
>
> This is the mathematica notebook https://www.dropbox.com/s/nyxx3rfdo7i0g3c/testNotebook.nb?dl=0
>
> Thank you very much!
>

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