Madspin weights

Asked by Tyler Reese on 2018-06-27

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

Question information

Language:
English Edit question
Status:
Solved
For:
MadGraph5_aMC@NLO Edit question
Assignee:
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Solved by:
Olivier Mattelaer
Solved:
2018-06-30
Last query:
2018-06-30
Last reply:
2018-06-28

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.

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?

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.

Tyler Reese (tylerbenreeese) said : #4

Thanks Olivier Mattelaer, that solved my question.