Particles %s is sometimes set as in the 3 and sometimes in the 3bar representations

Asked by Avirup Shaw on 2018-09-11

I have written a model file in feynrules for Vector leptoquark V2. While I generate the model file, it is perfectly correct with no error. However, when I have import this model file in the madgraph, it gives the following errors.

Error detected in sub-command import model LQ_V2_UFO --modelname
write debug file MG5_debug
If you need help with this issue please contact us on https://answers.launchpad.net/mg5amcnlo
InvalidModel : Particles V2p13~ is sometimes set as in the 3 and sometimes in the 3bar representations

how can remove this error.?

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Last query:
2018-09-11
Last reply:
2018-09-11

Hi,

FeynRules does not have a clear definition of what is 3 and 3bar representation.
As far as I know, all particle are set as 3 and all anti-particles are set as 3bar.
It is quite common that the model author are not aware of such definition and this leads to inconsistency in the UFO model.

In MG5aMC, we have decided to automatically correct those wrong UFO model as much as possible.
(Maybe not a smart idea since those errors continue to propagate due to that).
Looks like you are in a case, where MG5aMC can not decide if V2p13~ should be in the 3 or 3bar representation.

What you need to do is to look at the interaction with that particle and check that particular point.
If you need more help, you should ask a FR author.

Cheers,

Olivier

> On 11 Sep 2018, at 09:22, Avirup Shaw <email address hidden> wrote:
>
> New question #673705 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/673705
>
> I have written a model file in feynrules for Vector leptoquark V2. While I generate the model file, it is perfectly correct with no error. However, when I have import this model file in the madgraph, it gives the following errors.
>
> Error detected in sub-command import model LQ_V2_UFO --modelname
> write debug file MG5_debug
> If you need help with this issue please contact us on https://answers.launchpad.net/mg5amcnlo
> InvalidModel : Particles V2p13~ is sometimes set as in the 3 and sometimes in the 3bar representations
>
>
> how can remove this error.?
>
>
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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