MadGraph5_aMC@NLO

Wrong Vertices.py

Asked by Charlie

Dear MG5 Expert,

When I use feynrues to generate UFO model, vertices is like this

V_3 = Vertex(name = 'V_3',
             particles = [ P.<>CreateObjectParticleName[PartNameMG[Wi]], P.<>CreateObjectParticleName[PartNameMG[Wi]], P.<>CreateObjectParticleName[PartNameMG[Wi]] ],
             color = [ '1' ],
             lorentz = [ L.VVV1 ],
             couplings = {(0,0):C.GC_47})

MG5 give me error

can you please tell me what's wrong about this.

Thank you Very Much!

Charlie

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

This vertex does not follow the UFO convention.
The first rule of UFO convention is that everything should be valid Python expression which is not the case here.

So a problem occurs at FeynRules level. You might want to contact FR author about this.

Cheers,

Olivier

> On 9 Feb 2018, at 08:48, Charlie <email address hidden> wrote:
>
> New question #664226 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/664226
>
> Dear MG5 Expert,
>
> When I use feynrues to generate UFO model, vertices is like this
>
>
> V_3 = Vertex(name = 'V_3',
> particles = [ P.<>CreateObjectParticleName[PartNameMG[Wi]], P.<>CreateObjectParticleName[PartNameMG[Wi]], P.<>CreateObjectParticleName[PartNameMG[Wi]] ],
> color = [ '1' ],
> lorentz = [ L.VVV1 ],
> couplings = {(0,0):C.GC_47})
>
> MG5 give me error
>
> can you please tell me what's wrong about this.
>
> Thank you Very Much!
>
> Charlie
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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