MadGraph5_aMC@NLO

Generating heavy neutrino from Z decay with SM_HeavyN_NLO

Asked by Marzieh Bahmani

Hi,

I would like to generate the MC signal sample p p > Z > n1 neutrino , n1 -> l l v
I generated the process
import model SM_HeavyN_NLO
define vv =vm vm~ ve ve~ vt vt~
generate p p > vv n1 [QCD]

And for decay i use mad spin:
decay n1 > mu mu vv
(And so on for other channels)

my question is, if this syntax only produce the Z channel?
and what will be the fraction of lepton number violation events vs lepton number conserving ones?

many thanks

Marzieh

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

> my question is, if this syntax only produce the Z channel?

From that syntax, it is not clear but the following check seems to indicate that this is indeed the case.

> MG5_aMC>generate p p > vv n1 $$ Z
> Command "generate p p > vv n1 $$ Z" interrupted with error:
> NoDiagramException : No amplitudes generated from process Process: g/u/c/d/s/u~/c~/d~/s~/b/b~ g/u/c/d/s/u~/c~/d~/s~/b/b~ > vm/ve/vt/vm~/ve~/vt~ n1 $$ z WEIGHTED=8 @1. Please enter a valid process
> Please report this bug on https://bugs.launchpad.net/mg5amcnlo
> More information is found in 'MG5_debug'.
> Please attach this file to your report.
> MG5_aMC>generate p p > vv n1 j $$ Z
> Command "generate p p > vv n1 j $$ Z" interrupted with error:
> NoDiagramException : No amplitudes generated from process Process: g/u/c/d/s/u~/c~/d~/s~/b/b~ g/u/c/d/s/u~/c~/d~/s~/b/b~ > vm/ve/vt/vm~/ve~/vt~ n1 g/u/c/d/s/b/u~/c~/d~/s~/b~ $$ z WEIGHTED=12 @1. Please enter a valid process
> Please report this bug on https://bugs.launchpad.net/mg5amcnlo
> More information is found in 'MG5_debug'.
> Please attach this file to your report.

> On 3 Mar 2023, at 18:25, Marzieh Bahmani <email address hidden> wrote:
>
> import model SM_HeavyN_NLO
> define vv =vm vm~ ve ve~ vt vt~
> generate p p > vv n1 [QCD]

> and what will be the fraction of lepton number violation events vs lepton number conserving ones?

That i have no clue, I guess that you should be able to get that information out of the output file.

Cheers,

Olivier

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