MadGraph5_aMC@NLO

How to include t-channel particles in event files?

Asked by Johann Brehmer

Good morning,

is there any way to include t-channel particles in the event files? More specifically, is there a way to include the Ws in VBF processes?

Thanks a lot!

Cheers,
Johann

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

Hi Johann,

This is not possible to do.

They are first a technical problem: This will break the LHE convention. Meaning that shower program will not be able to understand that file.
But also a physical problem, since this information is not physical, since they are often interferences with various diagrams.
Therefore the presence of a particles in t-channel (and even more the identity of such particles) is not physical and therefore it is impossible
to write such information in a coherent way (but in some very specific case).

Actually, this is the exact same reason why we don't write off-shell particles in the LHE file.

Cheers,

Olivier

On Jun 3, 2013, at 10:31 AM, Johann Brehmer <email address hidden> wrote:

> New question #230098 on MadGraph5:
> https://answers.launchpad.net/madgraph5/+question/230098
>
> Good morning,
>
> is there any way to include t-channel particles in the event files? More specifically, is there a way to include the Ws in VBF processes?
>
> Thanks a lot!
>
> Cheers,
> Johann
>
> --
> You received this question notification because you are a member of
> MadTeam, which is an answer contact for MadGraph5.

Revision history for this message
Johann Brehmer (jhbrehmer) said : 		#2

Thanks Olivier Mattelaer, that solved my question.

Revision history for this message
Johann Brehmer (jhbrehmer) said : 		#3

Thanks a lot, Olivier!

I see your point and will have to look for alternative ways to do what I want.

Cheers,
Johann