MadGraph5_aMC@NLO

New model works but doesn't use four-vertices

Asked by Vincent Groff

Hello,

I've created a model of scalar electrodynamics in FeynRules and imported it in MG.
It seems to work fine, except that the four-vertex is not being used.
It is in the UFO file in vertices.py and the coupling is defined as order 1 in couplings.py.

Any idea why this is happening?

Thanks,
Vincent

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Did you check the following FAQ?

Cheers,

olivier
FAQ #1942: “How MadGraph assigns the order (QED/QCD/...) automatically?”.

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Vincent Groff (vgroff) said : 		#2

Yes I found something else along those lines.
However, when I run "display coupling_order", I just get
1 : weight = 1 (I called my coupling model "1" for whatever reason)
Doesn't this mean that the weighting is irrelevant?
Anyway, I tried running the same interactions with 1=99 and WEIGHTED=99 but that didn't seem to change anything - unless I have misunderstood how to work it?

If I run "display interactions," I can see that MG has successfully imported the 4-vertex. I am not sure why it doesn't use it though :(

Thanks for your help,
Vincent

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Vincent Groff (vgroff) said : 		#3

Apologies, it was actually due to an error in my model file.

Problem resolved, thanks for your help!