how to perform Charm decay in madgraph ?

Asked by zahra ghorbani moghaddam on 2018-09-11

Hi

I need to make some process out of charm decay via decay of D/D+-/D*/D_s..
I tried to define a multi particle like :

define pb = c c~ s s~ d d~

generate pb pb > W+ >n2 l+

I'm using the model with right handed neutrinos. I am not sure if I'm on the right track, and i'm wondering if I need to include mesons (D) as elementary particles in my model, then I would need to do for all D mesons.

Thank you for your suggestions!

Zahra

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Last query:
2018-09-11
Last reply:
2018-09-11

Hi,

I would indeed arguee that you have to include the mesons as elementary particle and then define the EFT operator which link the associate decay.

Cheers,

Olivier

> On 11 Sep 2018, at 16:27, zahra ghorbani moghaddam <email address hidden> wrote:
>
> New question #673716 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/673716
>
> Hi
>
> I need to make some process out of charm decay via decay of D/D+-/D*/D_s..
> I tried to define a multi particle like :
>
> define pb = c c~ s s~ d d~
>
> generate pb pb > W+ >n2 l+
>
> I'm using the model with right handed neutrinos. I am not sure if I'm on the right track, and i'm wondering if I need to include mesons (D) as elementary particles in my model, then I would need to do for all D mesons.
>
> Thank you for your suggestions!
>
> Zahra
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Thank you so much Olivier for the prompt answer.
So, whatever meson that I need, I should introduce it as elementary particle in my model with EFT, am I right?

Another relevant question, Does Pythia8 would help generating mesons? if yes, how would i be able to use the output in Madgraph?

Thanks a lot

Zahra

> So, whatever meson that I need, I should introduce it as elementary particle in my model with EFT, am I right?

That's what I think yes.

> Does Pythia8 would help generating mesons?

Really depends what you want to do here.
They do have a module for meson decay for sure, now if you want some BSM contribution to such decay.
I'm not sure how much they can help. But I have actually no idea.

> yes, how would i be able to use the output in Madgraph?

No. (At least i do not see any case where it can be usefull to do so)

Cheers,

Olivier

> On 11 Sep 2018, at 16:52, zahra ghorbani moghaddam <email address hidden> wrote:
>
> Question #673716 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/673716
>
> zahra ghorbani moghaddam posted a new comment:
> Thank you so much Olivier for the prompt answer.
> So, whatever meson that I need, I should introduce it as elementary particle in my model with EFT, am I right?
>
> Another relevant question, Does Pythia8 would help generating mesons? if
> yes, how would i be able to use the output in Madgraph?
>
> Thanks a lot
>
> Zahra
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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