MadGraph5_aMC@NLO

Producing semi-leptonic decays with MadSpin

Asked by Dominic Hirschbuehl

Dear MadSpin-Experts,

I am producing ttbar events with aMC@NLO and want to let them decay with MadSpin.
Since we typically produce different samples for di-leptonic, semi-leptonic and all-hadronic decays
I want to do this now also using MadSpin. For the di-leptonic and all-hadronic channels this is no problem,
however, how I can setup MadSpin to produce semi-leptonic events,
i.e. one top decays leptonically and one top hadronically. but randomly between the top and the antitop.

The poor man's solution would be to split the samples, where for one I let the top decay leptonically and the antitop hadronically and vice versa, but this is dangerous for later analysis. It would be much more preferable to have the decays randomly distributed.

Thanks in advance
  Dominic

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

Dear Dominic,

The only solution is indeed to split the sample.

Sorry,

Olivier

On Oct 9, 2013, at 3:46 PM, Dominic Hirschbuehl <email address hidden> wrote:

> New question #237087 on MadGraph5:
> https://answers.launchpad.net/madgraph5/+question/237087
>
> Dear MadSpin-Experts,
>
> I am producing ttbar events with aMC@NLO and want to let them decay with MadSpin.
> Since we typically produce different samples for di-leptonic, semi-leptonic and all-hadronic decays
> I want to do this now also using MadSpin. For the di-leptonic and all-hadronic channels this is no problem,
> however, how I can setup MadSpin to produce semi-leptonic events,
> i.e. one top decays leptonically and one top hadronically. but randomly between the top and the antitop.
>
> The poor man's solution would be to split the samples, where for one I let the top decay leptonically and the antitop hadronically and vice versa, but this is dangerous for later analysis. It would be much more preferable to have the decays randomly distributed.
>
> Thanks in advance
> Dominic
>
>
> --
> You received this question notification because you are a member of
> MadTeam, which is an answer contact for MadGraph5.

Revision history for this message
Dominic Hirschbuehl (hirsch-t) said : 		#2

Thanks Olivier Mattelaer, that solved my question.

Revision history for this message
mazuza (mghneimat) said : 		#3

Hello,

Is the question above still not possible in MadSpin?

Thanks,
 Mazuza

Revision history for this message
Olivier Mattelaer (olivier-mattelaer) said : 		#4

For having only semi-leptonic, this is indeed not possible.

Cheers,

Olivier