Lepton Universality

Asked by marlon

Hello, Does the event generation in the leptonic final states in the Beyond standard Model like B-L model in Madgraph assumes Lepton Universality ?

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Olivier Mattelaer
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Olivier Mattelaer (olivier-mattelaer) said :
#1

No.

Olivier

> On 25 Mar 2021, at 04:35, marlon <email address hidden> wrote:
>
> New question #696240 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/696240
>
> Hello, Does the event generation in the leptonic final states in the Beyond standard Model like B-L model in Madgraph assumes Lepton Universality ?
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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marlon (chuchupachula) said :
#2

What about the SM processes?

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Best Olivier Mattelaer (olivier-mattelaer) said :
#3

Hi,

The code is the same for SM and BSM, just the model is not the same.
Now depending of the model some optimization will be possible and some other will not be possible.
If all lepton are massless then the code optimize on that for example.
If the matrix-element are identical for two flavor (with identical mass) then the code will be further optimize accordingly
and so on. But those are not done assuming any type of symmetry or property those are check at generation time.

The only requirement for your UFO model is that it is CPT invariant.

Cheers,

Olivier

> On 25 Mar 2021, at 10:25, marlon <email address hidden> wrote:
>
> Question #696240 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/696240
>
> Status: Answered => Open
>
> marlon is still having a problem:
> What about the SM processes?
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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marlon (chuchupachula) said :
#4

Thanks Olivier Mattelaer, that solved my question.