MadGraph5_aMC@NLO

mmll cut in t t~ production

Asked by Yoav Afik

Dear experts,

I'm trying to generate t t~ with di-muon decay, and to apply an mmll cut. I do:
generate p p > t t~, t > b mu+ vm, t~ > b~ mu- vm~

and set:
set mmll 500

However, it seems that the mmll cut I impose do not change the value of the cross section I get. I tried to set a few different values, and always get the same result.
I use MG 2.7.3.

Any idea why? If so, is there another solution to generate a di-muon decay of a t t~ pair with mmll cut?

Best,

Yoav.

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

What is the value of cut_decays in your run_card?

Cheers,

Olivier

> On 13 Dec 2020, at 09:35, Yoav Afik <email address hidden> wrote:
>
> New question #694493 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/694493
>
> Dear experts,
>
> I'm trying to generate t t~ with di-muon decay, and to apply an mmll cut. I do:
> generate p p > t t~, t > b mu+ vm, t~ > b~ mu- vm~
>
> and set:
> set mmll 500
>
> However, it seems that the mmll cut I impose do not change the value of the cross section I get. I tried to set a few different values, and always get the same result.
> I use MG 2.7.3.
>
> Any idea why? If so, is there another solution to generate a di-muon decay of a t t~ pair with mmll cut?
>
>
> Best,
>
> Yoav.
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Revision history for this message
Yoav Afik (yoavafik) said : 		#2

Hi Olivier,

cut_decays was set to be False. I set it as True and it solved the problem.

Thanks!

Best,

Yoav.

Revision history for this message
Yoav Afik (yoavafik) said : 		#3

Thanks Olivier Mattelaer, that solved my question.