The issue with the process p p > h h in NMSSM

Asked by Harshal Kulkarni on 2021-05-18

Hi all,
          I am new to MadGraph and have a very basic query regarding the pair production of SM-like Higgs h h in the NMSSM and MSSM models. I am trying to generate the process p p > h h where h is SM-like Higgs in the NMSSM and MSSM models using the online MadGraph5 server. However, whenever I try to generate the processes like p p > h1 h1, I am not getting any result. The server shows an error like: "models.import_ufo.UFOImportError: /home/madgraph/MG5/models/nmssm directory is not a valid UFO model: couplings.py is missing" and keeps showing "waiting for process information". I don't really know what this exactly means, but it seems that higgs pair production processes are not achievable in NMSSM. Could you please help me with this? How exactly do I generate the Higgs pair production processes?
          Moreover, I was unable to find the symbols to be used for NMSSM particles. Could you guide me here as well? Pardon me if the query is very elementary, it has only been a couple of days since I started using MadGraph.

P.S. - A question regarding the higgs production has already been asked earlier (in 2013) and what I could understand from the answer is that the higgs production processes in NMSSM and MSSM were supposed to be included in the updated versions.

Thanks,
Harshal

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

Hi,

All our webserver are currently down. We are working on a new platform but for the moment even simple computation needs to be done with a local installation of MG5aMC.

Now to your question, if those process are loop induced then you would need the following syntax
generate p p > h1 h1 [QCD]

For that you would need that the model support loop correction which I think does exists for the MSSM (I doubt for the NMSSM).
You should check the FeynRules database to check if such model does exists or not.

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Harshal Kulkarni (hck18ms056) said :
#2

Thank you so much Olivier. How much time (estimated) would it take for the webserver to be up again?

So currently I must download the MG5aMC and then use the syntax generate p p > h1 h1 [QCD] to generate the process?

Thank you again for the answer.

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

A matter of months probably.
Now since your computation needs specific UFO model, i do not know if such computation will even be possible online.

> So currently I must download the MG5aMC

yes

> and then use the syntax generate p p > h1 h1 [QCD] to generate the process?

You first have to import a UfO model able to do such computation or if such model is not public then generate it yourself.

Cheers,

Olivier

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Harshal Kulkarni (hck18ms056) said :
#5

Thanks Olivier Mattelaer, that solved my question.