How to generate quarkonium amplitudes in NRQCD

Asked by Shan-Liang Zhang

Hi,

I am writting to you to ask how to generate quarkonium(cc~) amplitudes in NRQCD within MadGraph5 as described in https://iopscience.iop.org/article/10.1088/1126-6708/2008/02/102.

I do not no how to setup and generate the heavy-quarkonium at special state. I have tried to figure out its for a long time, but I still not very sure how to generate it. Can you give me a simple example or tell me how to set up the process.

I am looking forward to hearing some feedbacks from you.

Best regeards.
Shanliang

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Olivier Mattelaer (olivier-mattelaer) said :
#1

Hi,

This paper is quite old and this type of generation is not supported anymore within our official version (MG5_aMC).
The latest version of the code supporting such type of generation is MadGraph4 (which is more than 10 years old).
Which likely means that you will have a lot of issue to make it run with recent compiler/…

So my suggestion would be to use HELACONIA for such type of computation.
This code can even be run online via https://nloaccess.in2p3.fr/ <https://nloaccess.in2p3.fr/>

Cheers,

Olivier

> On 28 Jun 2021, at 10:05, Shan-Liang Zhang <email address hidden> wrote:
>
> New question #697751 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/697751
>
> Hi,
>
> I am writting to you to ask how to generate quarkonium(cc~) amplitudes in NRQCD within MadGraph5 as described in https://iopscience.iop.org/article/10.1088/1126-6708/2008/02/102.
>
> I do not no how to setup and generate the heavy-quarkonium at special state. I have tried to figure out its for a long time, but I still not very sure how to generate it. Can you give me a simple example or tell me how to set up the process.
>
> I am looking forward to hearing some feedbacks from you.
>
> Best regeards.
> Shanliang
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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