MadGraph5_aMC@NLO

How to exclude diagrams in standalone code

Asked by Steven Jeremies

Hello,

i am working on the u b > d t H process in the sm-no_b_mass model which yields 2 contributing diagrams. How can I exclude one of these in a standalone code? I tried to change the NGRAPHS and N_MAX_CG parameters in the P1_ub_dth folder in the SubProcesses but this did not work.

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

Did you check:

https://cp3.irmp.ucl.ac.be/projects/madgraph/wiki/FAQ-General-15

But if you want to edit already existing standalone code,
you can also edit the file matrix.f

and set either AMP(1) = (0d0, 0d0)
or
AMP(2) = (0d0, 0d0)

this might not be the most optimal way to perform the computation, but for that you need the above method anyway.

Cheers,

Olivier

> On 13 Jun 2021, at 23:05, Steven Jeremies <email address hidden> wrote:
>
> New question #697516 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/697516
>
> Hello,
>
> i am working on the u b > d t H process in the sm-no_b_mass model which yields 2 contributing diagrams. How can I exclude one of these in a standalone code? I tried to change the NGRAPHS and N_MAX_CG parameters in the P1_ub_dth folder in the SubProcesses but this did not work.
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Revision history for this message
Steven Jeremies (minits) said : 		#2

Dear Olivier,

I just wanted to thank you for always patiently answering my questions!

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Steven Jeremies (minits) said : 		#3

Thanks Olivier Mattelaer, that solved my question.