altering couplings for a C2HDM process involving fermions

Asked by Samuel Barson on 2018-07-23

Hello,

I am currently trying to scale the coupling equations for 2HDM process (u u~ >h1 and d d~ > h1) so that they can be applied to a composite 2HDM model, but upon introducing a scale factor eg 100 there seems to be no difference in the calculated cross section. I was wondering if it is possible/ how to scale a coupling equation from couplings.py to achieve a new and accurate cross section for the process?

Thanks,

Sam

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Last query:
2018-07-23
Last reply:
2018-07-23

Hi,

Yes adding a factor "100" in couplings.py should work.
You should obviously re-generated the process directory after having modified the model.
A nicer way is to define a new parameter in parameters.py such that you can define the value in the param_card.dat

Cheers,

Olivier

> On 23 Jul 2018, at 14:02, Samuel Barson <email address hidden> wrote:
>
> New question #671056 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/671056
>
> Hello,
>
> I am currently trying to scale the coupling equations for 2HDM process (u u~ >h1 and d d~ > h1) so that they can be applied to a composite 2HDM model, but upon introducing a scale factor eg 100 there seems to be no difference in the calculated cross section. I was wondering if it is possible/ how to scale a coupling equation from couplings.py to achieve a new and accurate cross section for the process?
>
> Thanks,
>
> Sam
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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