MadGraph5_aMC@NLO

cross section of tt+\gamma\gamma in magraph

Asked by Winston

Hi experts,
 I obtained the cross section of tt+\gamma\gamma production at LHC through madgraph. The results is 0.01011 ± 9.9e-06 at 13TeV. I think it's too small. The process I generated is exactly p p > t t~ a a.
In this article(https://link.springer.com/article/10.1140/epjc/s10052-016-4048-2), it's said that this process has cross section of
1.02pb. May I ask which one is more reliable?

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

This cross-section is infinite without cuts.
So did you use the same cut as the paper?

Cheers,

Olivier

> On 15 Nov 2020, at 13:01, Winston <email address hidden> wrote:
>
> New question #694026 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/694026
>
> Hi experts,
> I obtained the cross section of tt+\gamma\gamma production at LHC through madgraph. The results is 0.01011 ± 9.9e-06 at 13TeV. I think it's too small. The process I generated is exactly p p > t t~ a a.
> In this article(https://link.springer.com/article/10.1140/epjc/s10052-016-4048-2), it's said that this process has cross section of
> 1.02pb. May I ask which one is more reliable?
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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Winston (adampan) said : 		#2

Hi Olivier,
 Here I just generated p p > t t~ a a with default setting in madgraph.
They are maybe a little difference.

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Launchpad Janitor (janitor) said : 		#3

This question was expired because it remained in the 'Open' state without activity for the last 15 days.