MadGraph5_aMC@NLO

Cuts on internal particles

Asked by Matthew Low

Dear Madgraph team,

I'd like to apply a cut like ptheavy, but on an internal particle. For example, p p > t t~ , t > b j j , t~ > b~ j j , but I would like to set a pt cut on the tops. How can I do this?

Thanks,
- Matthew

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

Hi Matthew,

You need to hardcode your cut in cuts.f.
Since only the momenta of final state particle are available, you need first to reconstruct the
momenta of the two top.
For that you can use that one top is the sum of momenta 3,4 and 5 and that the second one is 6,7,8

Cheers,

Olivier
On 25 Sep 2015, at 06:22, Matthew Low <email address hidden> wrote:

> New question #271773 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/271773
>
> Dear Madgraph team,
>
> I'd like to apply a cut like ptheavy, but on an internal particle. For example, p p > t t~ , t > b j j , t~ > b~ j j , but I would like to set a pt cut on the tops. How can I do this?
>
> Thanks,
> - Matthew
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Revision history for this message
Matthew Low (mattlow) said : 		#2

Thanks Olivier Mattelaer, that solved my question.