MadGraph5_aMC@NLO

Quarkonium states in MadGraph5

Asked by Ameir Shaa

Hello MadGraph Team,

I understand that in MG4, we could use MadOnia to specify Quarkonium particles (such as J/Psi, Upsilon, etc) and then add decay process such as (generate p p > mu+ mu- ; add process p p > jpsi , jpsi > mu+ mu-). The cross section for this quarkonium decay process would then be then added to the main process (i.e. the Drell Yan process to produce muons).

Now, for MG5, I understand that MadOnia is no longer supported.

My question is this: are the amplitudes for the various quarkonium decays automatically added to the main process in MG5?

Many thanks in advance,

Ameir

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Olivier Mattelaer
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Best Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi Ameir,

I'm not a Madonia expert, but this is my understanding of the status of Madonia:

> 1) I understand that in MG4, we could use MadOnia to specify Quarkonium particles (such as J/Psi, Upsilon, etc)

That's correct.

> and then add decay process such as (generate p p > mu+ mu- ; add process p p > jpsi , jpsi > mu+ mu-).

Such syntax was introduced in MG5, so I doubt that the decay was included in MadOnia

> The cross section for this quarkonium decay process would then be then added to the main process (i.e. the Drell Yan process to produce muons).

The generation of muon via perturbative theory and via NRQCD cannot be mixed. so you had to generate both separatly.

> Now, for MG5, I understand that MadOnia is no longer supported.

Correct my advise would be to check the possibility of HELACONIA and if that does not fit your need check MA4 and MadOnia.

>My question is this: are the amplitudes for the various quarkonium decays automatically added to the main process in MG5?

No they are not.

Cheers,

Olivier

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Ameir Shaa (ameirshaa) said : 		#2

Hi Olivier,

Many thanks for your answer; you were really helpful! :)