MadGraph5_aMC@NLO

Shower a SUSY process with Pythia8

Asked by Nikita Shalimov

Hello,

I would like to generate a susy process and then have Pythia8 do the parton showering and merging.
In mg5_aMC, i am running:

import model mssm
generate p p > go go
add process p p > go go j
output

in the run_card, I set
1 = ickkw (MLM)
200 = xqcut (for an 800 GeV Gluino)

and I have made sure that the pythia8_path is correctly set in both mg5_configurarion.txt (in mg5 base directory) and me5_configuration.txt (in the process directory). However, when I generate events, the showering is done in Pythia6, presumably via the built in pythia-pgs package.
I would like to know if there is a way to force MadGraph to use Pythia8 for the showering.

I have seen that for an SM process at NLO, e.g. something like

generate p p > t t~ [QCD]

the run_card has a setting to do exactly this -
PYTHIA8 = parton_shower

But have not found a way to do this in a susy model.

Thank you,
Nikita

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Solved by:
Olivier Mattelaer
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Revision history for this message
Best Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

We are currently not able to perform shower with PY8 for LO processes.
This is a development in progress but it is not mature yet to be release in the next release.

Cheers,

Olivier

> On Mar 24, 2016, at 23:32, Nikita Shalimov <email address hidden> wrote:
>
> New question #289192 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/289192
>
> Hello,
>
> I would like to generate a susy process and then have Pythia8 do the parton showering and merging.
> In mg5_aMC, i am running:
>
> import model mssm
> generate p p > go go
> add process p p > go go j
> output
>
> in the run_card, I set
> 1 = ickkw (MLM)
> 200 = xqcut (for an 800 GeV Gluino)
>
> and I have made sure that the pythia8_path is correctly set in both mg5_configurarion.txt (in mg5 base directory) and me5_configuration.txt (in the process directory). However, when I generate events, the showering is done in Pythia6, presumably via the built in pythia-pgs package.
> I would like to know if there is a way to force MadGraph to use Pythia8 for the showering.
>
> I have seen that for an SM process at NLO, e.g. something like
>
> generate p p > t t~ [QCD]
>
> the run_card has a setting to do exactly this -
> PYTHIA8 = parton_shower
>
> But have not found a way to do this in a susy model.
>
> Thank you,
> Nikita
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Revision history for this message
Nikita Shalimov (nshalimov) said : 		#2

Thanks Olivier Mattelaer, that solved my question.