MadGraph5_aMC@NLO

Madspin weights

Asked by Tyler Reese

I generated a process then decayed the LHE file in madspin. Where could I find the weights for the decayed process?

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

MadSpin does not add any weights.
It just scale all of those already present by the Branching ratio.

Cheers,

Olivier

> On 27 Jun 2018, at 22:52, Tyler Reese <email address hidden> wrote:
>
> New question #670516 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/670516
>
> I generated a process then decayed the LHE file in madspin. Where could I find the weights for the decayed process?
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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Tyler Reese (tylerbenreeese) said : 		#2

Oliver,

Thanks for your reply but I'm still confused. Perhaps I was too vague initially and need to be more specific. I generated a VBF process BSM with Higgs Characterisation. I have a cross-section and now I've also decayed the process with madspin. Where could I find the branching ratios or the decay rates for the decay?

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

Hi,

If you did everything in one go,
you can see the file crossx.html
where you will see the cross-section before and after madspin.
From that you can make the ratio and see the BR that was used for the computation.

Otherwise if you decay a single particle, you can also look at the LHE file produce after madspin
and check the BR information present in the param_card for that particle (and read the line corresponding to your process)

Cheers,

Olivier

> On 28 Jun 2018, at 12:48, Tyler Reese <email address hidden> wrote:
>
> Question #670516 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/670516
>
> Tyler Reese posted a new comment:
> Oliver,
>
> Thanks for your reply but I'm still confused. Perhaps I was too vague
> initially and need to be more specific. I generated a VBF process BSM
> with Higgs Characterisation. I have a cross-section and now I've also
> decayed the process with madspin. Where could I find the branching
> ratios or the decay rates for the decay?
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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Tyler Reese (tylerbenreeese) said : 		#4

Thanks Olivier Mattelaer, that solved my question.