Reference frame for polarised templates in diboson production inclusive in the number of jets

Asked by lucia di ciaccio on 2019-12-17

Dear Madgraph Authors,

  we (ATLAS WZ team) are in the process of using Madgraph to generate samples of pp->WLZL, WTZL, WLZT, WTZT inclusive in the number of jets in order to get polarisation templates. The aim is to measure the cross section separately for the different polarisation states.

  We are aware that for pp->jjWW it is possible to perform the (LO) simulation of the process involving external states in fixed helicity eigenstates, using an arbitrary reference frame.

 We are interested in the reference frame in which the WZ pair is at rest and would like to know if this feature (choice of the reference frame to compute the final state polarisation templates) is available also for the pp->WZ production inclusive in the number of jets, and if not, if this is something that could be quickly available.

   Thanks in advance for your answer.
    Best Regards

    Lucia on behalf of the WZ ATLAS team

Question information

Language:
English Edit question
Status:
Solved
For:
MadGraph5_aMC@NLO Edit question
Assignee:
No assignee Edit question
Solved by:
Olivier Mattelaer
Solved:
2019-12-17
Last query:
2019-12-17
Last reply:
2019-12-17

Hi,

Yes this feature is not specific to any process.
You will find details here: arXiv:1912.01725 <http://arxiv.org/abs/arXiv:1912.01725>
Such feature are officially supported in 2.7.0 (not yet released).
But you can get the beta version here:
https://bazaar.launchpad.net/~maddevelopers/mg5amcnlo/2.6.5_polarization/tarball/341

Please note that such above version is not suitable for NLO computation (even without polarization).

Cheers,

Olivier

> On 17 Dec 2019, at 21:12, lucia di ciaccio <email address hidden> wrote:
>
> New question #687214 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/687214
>
> Dear Madgraph Authors,
>
> we (ATLAS WZ team) are in the process of using Madgraph to generate samples of pp->WLZL, WTZL, WLZT, WTZT inclusive in the number of jets in order to get polarisation templates. The aim is to measure the cross section separately for the different polarisation states.
>
> We are aware that for pp->jjWW it is possible to perform the (LO) simulation of the process involving external states in fixed helicity eigenstates, using an arbitrary reference frame.
>
> We are interested in the reference frame in which the WZ pair is at rest and would like to know if this feature (choice of the reference frame to compute the final state polarisation templates) is available also for the pp->WZ production inclusive in the number of jets, and if not, if this is something that could be quickly available.
>
> Thanks in advance for your answer.
> Best Regards
>
> Lucia on behalf of the WZ ATLAS team
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

lucia di ciaccio (ldcldc) said : #2

Thanks a lot for the quick answer

  Best
   Lucia

lucia di ciaccio (ldcldc) said : #3

Thanks Olivier Mattelaer, that solved my question.