MadGraph5_aMC@NLO

Missing diagrams for pp > ww

Asked by Afiq Aize

Hi,

I am a new MG user and I'm trying to generate this process:

p p > w+ w- [all=QCD]

Upon doing so I noticed that some diagrams are missing, particularly the gluon fusion ones. I am able to generate them separately, but how do I add them to the main generation for xsec calculation etc?

Thanks!

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

Hi,

The g g > w+ w- loop induced diagram is technically a NNLO computation (even if loop induced).
Since 2.3.0, we are able to compute the loop induced diagram contribution (but this functionality is still in beta, and the associate paper not yet release)
But we are not able to compute those at the same time as a NLO computation.
Doing the same with a LO computation should be easier but we do not support it either.

Cheers,

Olivier

On 06 May 2015, at 15:06, Afiq Aize <email address hidden> wrote:

> New question #266565 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/266565
>
> Hi,
>
> I am a new MG user and I'm trying to generate this process:
>
> p p > w+ w- [all=QCD]
>
> Upon doing so I noticed that some diagrams are missing, particularly the gluon fusion ones. I am able to generate them separately, but how do I add them to the main generation for xsec calculation etc?
>
> Thanks!
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Revision history for this message
Afiq Aize (watashinokonoka) said : 		#2

Thanks Olivier Mattelaer, that solved my question.

Revision history for this message
Olivier Mattelaer (olivier-mattelaer) said : 		#3

Note that the paper is now released: arXiv:1507.00020