MadGraph5_aMC@NLO

Four-fermion operator

Asked by rojalin padhan

Dear mg5 experts,

I found at some of the previous questions that the mg5 can not handle 4-fermion operator with Majorana fermion. Could you please let me know about the current status?

Is there any way to solve this issue?

thanks,
Rojalin

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Olivier Mattelaer
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Best Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

This is the exact same status since 2012.
The best solution is to use effective super masssive scalar to split the four point interaction into three point interaction.

In principle, such model are veto at the "import model" stage
and the issue is checked when one need to create the corresponding helicity routine.
So in principle, you can bypass the first crash and if your process does not lead to a crash it is very likely that everything is fine.

Cheers,

Olivier

> On 27 Dec 2021, at 05:45, rojalin padhan <email address hidden> wrote:
>
> New question #700001 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/700001
>
> Dear mg5 experts,
>
> I found at some of the previous questions that the mg5 can not handle 4-fermion operator with Majorana fermion. Could you please let me know about the current status?
>
> Is there any way to solve this issue?
>
>
> thanks,
> Rojalin
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Revision history for this message
rojalin padhan (rossy.mg) said : 		#2

Thanks Olivier Mattelaer, that solved my question.