MadGraph5_aMC@NLO

Partial off-shell decay in diHiggs

Asked by Yizhou Cai

Dear experts,

I am wondering if there is a way to specify a particle off-shell. We are studying the process "p p > H2, (H2 > h1 h1, (h1 > b b~, h1 > ah ah))", and I want the h1 which decay to "ah ah" to be off-shell. Can it be done in MadGraph?

Many thanks for your help!

Regards,
Yizhou

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

No we do not have any official syntax for that.
Maybe this fits what you want/need
p p > H2, (H2 > h1 > h1 ah ah , h1 > b b~)
But since you have one h1 onshell and one offshell you might have some issue with the computation of symmetry factor.
So it is not impossible that your cross-section might be off by a factor of two. Please check carefully if you use such weird syntax.

Cheers,

Olivier

> On 14 Aug 2021, at 17:25, Yizhou Cai <email address hidden> wrote:
>
> New question #698378 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/698378
>
> Dear experts,
>
> I am wondering if there is a way to specify a particle off-shell. We are studying the process "p p > H2, (H2 > h1 h1, (h1 > b b~, h1 > ah ah))", and I want the h1 which decay to "ah ah" to be off-shell. Can it be done in MadGraph?
>
> Many thanks for your help!
>
> Regards,
> Yizhou
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Revision history for this message
Yizhou Cai (yzcai) said : 		#2

Thanks Olivier Mattelaer, that solved my question.