MadGraph5_aMC@NLO

top polarisation and madspin decays

Asked by Ezequiel Alvarez

Hello!

I'm reading the 4-years old thread

https://answers.launchpad.net/mg5amcnlo/+question/266533

on decay of polarized tops.

is still valid? Or is there any easier/modern way to:

- modify matrix1.f to only produce some set of polarisation in the tops
- generate polarized tops
- decay them in such a way that the decay maintains the spin info?

As far as I understand, I cannot use MadSpin directly connected to MG output lhe, but instead I should use the old Decay package. Is this correct?

Thank you very much, Ezequiel.

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Yes this is still the only way.

We are now working on a method, which will give you more control.
So check the UpdatesNotes of future version to check when this will be possible in a nicer way.

Cheers,

Olivier

> On 16 Aug 2019, at 19:12, Ezequiel Alvarez <email address hidden> wrote:
>
> New question #682957 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/682957
>
> Hello!
>
> I'm reading the 4-years old thread
>
> https://answers.launchpad.net/mg5amcnlo/+question/266533
>
> on decay of polarized tops.
>
> is still valid? Or is there any easier/modern way to:
>
> - modify matrix1.f to only produce some set of polarisation in the tops
> - generate polarized tops
> - decay them in such a way that the decay maintains the spin info?
>
> As far as I understand, I cannot use MadSpin directly connected to MG output lhe, but instead I should use the old Decay package. Is this correct?
>
> Thank you very much, Ezequiel.
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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