Neutrino trident

Asked by ouseph cj

Dear Madgraph experts,
What is the command for the neutrino trident production,

Basically, i am looking for the process 1) p vm > p vm mu+ mu-
and the subprocess is v \gamma > v mu+ mu-, how can I only generate the first process only with a virtual photon in the field of the nucleus?

Thanking you with regards
Ouseph

Question information

Language:
English Edit question
Status:
Answered
For:
MadGraph5_aMC@NLO Edit question
Assignee:
No assignee Edit question
Last query:
Last reply:
Revision history for this message
Olivier Mattelaer (olivier-mattelaer) said :
#1

This is not a type of production that we do very often, the code should work in principle but I would suggest that you check a bit that the pdf implemented is the one that you want. (and that the mass of the ion/... are correctly handle within the code. The photon PDF is in the iww

the code would be
generate a vm > a mu+ mu-
output
launch
set lpp1 a # this trigger the special pdf
set nb_proton1 108 # this should change the total electric charge. Please check that this impact the PDF
set mass_ion1 154. # this change the mass of the ion (should also impact the PDF --please check--
set ebeam1 1000*208

Revision history for this message
ouseph cj (ouseph444) said (last edit ):
#2

Dear Oliver,

Thanks for your reply.
If want to generate the Feynman diagram from arXiv:1406.2332v2(Fig1)( with and without Z'), then how should I modify the code?

basically, it is a neutrino nucleon fixed target scattering-producing neutrino trident. p vl > p vl l+ l-

I did the fixed target scattering with the madgraph before, but I don't know how to generate this particular diagram(photon from the nucleus) with the madgraph.

Best
Ouseph

Revision history for this message
Olivier Mattelaer (olivier-mattelaer) said :
#3

just add the line
import model XXXXXX

where XXXXX is the name of the model that you want to use for such generation.

Cheers,

Olivier

> On 7 Sep 2022, at 05:40, ouseph cj <email address hidden> wrote:
>
> Question #703074 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/703074
>
> Status: Answered => Open
>
> ouseph cj is still having a problem:
> Dear Oliver,
>
> Thanks for your reply.
> If want to generate the Feynman diagram in arXiv:1406.2332v2(Fig1)( with and without Z'), then how should I modify the code?
>
> basically, it is a neutrino nucleon fixed target scattering-producing
> neutrino trident.
>
> Best
> Ouseph
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Can you help with this problem?

Provide an answer of your own, or ask ouseph cj for more information if necessary.

To post a message you must log in.