MadGraph5_aMC@NLO

Doubt on n. events and @ in the cross-section result

Asked by Gabriel Vian

Hello, I've realized that when I run a process on MadGraph I get the following

Normalization to the luminosity = 10 +/- 1 events

Is this quantity the product between the luminosity and the cross-section for a given process?

Also, with the cross-section result, there is a @ percentage, for instance:

 cross-section = 100 pb @ 0.36%.

What does this @ percentage mean?

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

None of the line that you report about ring a bell.
Our best bet is that those lines are part of the MadAnalysis framework (or from other analysis framework that you might have used and that can be linked to MG5aMC).

At least in madanalysis5, they like to normalise all plot to a given luminosity (not sure which one) so this would explain your first line. For the second, I do not know (likely the statistical uncertainty?) the best is to ask to the author of the analysis tool that you are using.

Cheers,

Olivier

> On 1 Mar 2024, at 12:15, Gabriel Vian <email address hidden> wrote:
>
> cross-section = 100 pb @ 0.36%.

Can you help with this problem?

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