MadGraph5_aMC@NLO

Results from Madgraph and Sushi

Asked by Sarah

Good morning experts

I hope you are doing well

I generated the process in 2HDM
gg> A [QCD] for a benchmark point
Then I use Sushi code to get the cross section of ggA at the same benchmark point at LO.

I got different results, the result from Sushi is larger by 1.5.

Do you know the reason beyond the difference?

Best regards

Sarah

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

I should expect to have a large scale uncertainty for that process. So I guess that the default scale choice is not the same in both program.

Cheers,

Olivier

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Sarah (sarahwarad) said : 		#2

Thank you Olivier for your reply.
I didn't find in Madgraph manual how to change the scale.
Do you know how the scale can be changed in Madgraph?

Best regards

Sarah

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Olivier Mattelaer (olivier-mattelaer) said : 		#3

Olivier Mattelaer suggests this article as an answer to your question:
FAQ #3325: “How to implement a new dynamical scale choice”.

Can you help with this problem?

Provide an answer of your own, or ask Sarah for more information if necessary.

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