MadGraph5_aMC@NLO

aMC@NLO equivalent of POWHEG's "bornsuppfact" flag

Asked by Robert Hambrock

I'm computing heavy flavor production spectra at 5.02TeV with aMC@NLO matched to Herwig++.

To improve statistics in the high pT domain (up to 100GeV), I would like to produce weighted events that overpopulate the tail of the production spectrum. In POWHEG, I can perform this via the "bornsuppfact" flag. Does aMC@NLO have an equivalent for this? I'd assume this would be part of MadWeight, but I could not find this feature documented.

Uniformly sampling x in the PDFs would help, but this answer suggests that this is not implemented natively:
https://answers.launchpad.net/mg5amcnlo/+question/275409

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

Hi,

We have such option at Leading Order (implemented very recently) but not at NLO.

Cheers,

Olivier
> On 29 Mar 2017, at 17:03, Robert Hambrock <email address hidden> wrote:
>
> New question #599796 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/599796
>
> I'm computing heavy flavor production spectra at 5.02TeV with aMC@NLO matched to Herwig++.
>
> To improve statistics in the high pT domain (up to 100GeV), I would like to produce weighted events that overpopulate the tail of the production spectrum. In POWHEG, I can perform this via the "bornsuppfact" flag. Does aMC@NLO have an equivalent for this? I'd assume this would be part of MadWeight, but I could not find this feature documented.
>
> Uniformly sampling x in the PDFs would help, but this answer suggests that this is not implemented natively:
> https://answers.launchpad.net/mg5amcnlo/+question/275409
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Revision history for this message
Robert Hambrock (roberthambrock) said : 		#2

Hi Oliver,

thank you for the extremely swift response!
Is such an option in the pipeline for NLO in the near future?
For the time being, I will switch to POWHEG then.

All the best,
Robert

Revision history for this message
Robert Hambrock (roberthambrock) said : 		#3

Thanks Olivier Mattelaer, that solved my question.

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

They were some discussion on that direction, but I do not think that anyone is actively working on it.

Cheers,

Olivier

> On 29 Mar 2017, at 17:37, Robert Hambrock <email address hidden> wrote:
>
> Question #599796 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/599796
>
> Status: Answered => Solved
>
> Robert Hambrock confirmed that the question is solved:
> Hi Oliver,
>
> thank you for the extremely swift response!
> Is such an option in the pipeline for NLO in the near future?
> For the time being, I will switch to POWHEG then.
>
> All the best,
> Robert
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.