MadGraph5_aMC@NLO

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Asked by Fatima

Dear All,
I am trying to generate this process: pp -> Z, Z -> e+ e- mu+ mu-. It can be generated by involving the Z* and gamma mediators. I want to remove the Z* mediator.
This command dose not work generate p p >Z, Z > e+ e- mu+ mu- / Z
Are there ways to delete Z* mediator?
Any suggestions would be greatly appreciated.
Best regards

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

What you try to do is diagram filtering.
Removing Feynman Diagram is dangerous since it can break gauge and lorentz invariance.
So you need to be carefull when you do that and check lorentz invariance of your result.

The syntax
> generate p p >Z, Z > e+ e- mu+ mu- $$ Z

should do what you ask for.

Cheers,

Olivier

> On 24 Mar 2023, at 03:00, Fatima <email address hidden> wrote:
>
> New question #705926 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/705926
>
> Dear All,
> I am trying to generate this process: pp -> Z, Z -> e+ e- mu+ mu-. It can be generated by involving the Z* and gamma mediators. I want to remove the Z* mediator.
> This command dose not work generate p p >Z, Z > e+ e- mu+ mu- / Z
> Are there ways to delete Z* mediator?
> Any suggestions would be greatly appreciated.
> Best regards
>
>
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Revision history for this message
Fatima (physiquefa) said : 		#2

Dear Olivier,
thanks a lot.
Fatima

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