# Discrepancies X-sections e+e- collisions

Asked by Cesare Cazzaniga on 2021-03-10

Hello,

I have some problems related to understand the discrepancies I have found between MadGraph cross-sections and my references. For example, I tried to generate at sqrt(s) = 240 GeV:

1. e+ e- -> e+ e- Madgraph: 670 pb , Reference (BABAYAGA): 930 pb

2. e+ e- -> q q Madgraph: 12 pb, Reference (Whizard): 54.1 pb

3. e+ e- -> Z e e Madgraph: 0.155 pb, Reference (Whizard): 4.54 pb

Is it possible such a discrepancy ? How do I have to interpret it ?

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 Olivier Mattelaer (olivier-mattelaer) said on 2021-03-10: #1

Hi,

Did you check the default cut and be sure that they are the same (as well as all the mass/parameter in particular aEW)

Cheers,

Olivier

> On 10 Mar 2021, at 15:15, Cesare Cazzaniga <email address hidden> wrote:
>
> New question #695970 on MadGraph5_aMC@NLO:
>
> Hello,
>
> I have some problems related to understand the discrepancies I have found between MadGraph cross-sections and my references. For example, I tried to generate at sqrt(s) = 240 GeV:
>
> 1. e+ e- -> e+ e- Madgraph: 670 pb , Reference (BABAYAGA): 930 pb
>
> 2. e+ e- -> q q Madgraph: 12 pb, Reference (Whizard): 54.1 pb
>
> 3. e+ e- -> Z e e Madgraph: 0.155 pb, Reference (Whizard): 4.54 pb
>
>
> Is it possible such a discrepancy ? How do I have to interpret it ?
>
>
> --

 Cesare Cazzaniga (ccazzaniga) said on 2021-03-10: #2

Hi,

no indeed I have to check them. Sorry, I have just started 2 days ago to use MadGraph, so I need to get accustomed to all of these. In case the problem will persist I will let you know

thanks