MadGraph5_aMC@NLO

Problem while implimenting the generated UFO in MadGraph

Asked by Siddharth

I tried generating the process, p p > hpp1 hpp1c (hpp1 is the doubly charged Higgs and hpp1c is its conjugate) by using the UFO I have generated from SARAH. But I am getting the following error. However, any SM-like process runs quite well like p p > t t~, etc. I couldn't figure where should I look for such an error. Your help will be quite helpful, thanks in advance.

Command "launch " interrupted in sub-command:
"launch" with error:
ValueError : String 1 T(1,2) cannot be simplified to a number!
Please report this bug on https://bugs.launchpad.net/mg5amcnlo
More information is found in 'MG5_debug'.
Please attach this file to your report.

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Solved by:
Olivier Mattelaer
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Olivier Mattelaer (olivier-mattelaer) said : 		#1

This is the type of error that you get when the color-structure for some vertex are not set correctly.
The most typical error is to have a mixing of color and anti-colour index for the same particle in particular
for ElectroWeak Vertex with QCD charged particles.

Since this issue is very common with FeynRules, we have some code to auto-correct those when this happens but for that hack to work we need to have all QCD charged particles to couple to gluon.

Cheers,

Olivier

PS: Obviously this hack does not always work, this is not our role to correct all the invalid UFO model.

> On 22 Apr 2021, at 17:33, Siddharth <email address hidden> wrote:
>
> New question #696697 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/696697
>
> I tried generating the process, p p > hpp1 hpp1c (hpp1 is the doubly charged Higgs and hpp1c is its conjugate) by using the UFO I have generated from SARAH. But I am getting the following error. However, any SM-like process runs quite well like p p > t t~, etc. I couldn't figure where should I look for such an error. Your help will be quite helpful, thanks in advance.
>
> Command "launch " interrupted in sub-command:
> "launch" with error:
> ValueError : String 1 T(1,2) cannot be simplified to a number!
> Please report this bug on https://bugs.launchpad.net/mg5amcnlo
> More information is found in 'MG5_debug'.
> Please attach this file to your report.
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Revision history for this message
Siddharth (siddharthprasad) said : 		#2

As I have generated the UFO through SARAH, I couldn't figure out the points you raised. I have attached the link of my UFO, Can you please let me know where should I search for the error?

https://drive.google.com/drive/folders/1a1luv51Q1rIXnTJF4s2QtnKuvdzuU18O?usp=sharing

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

The error is in the color structure of some vertices (vertices.py)
You have likely a lot of those to be wrong and I’m not going to check by hand all your vertices to have the full list of those who are wrong.
My only suggestion would be to contact Sarah author and ask them to point you to the mistake you made in the implementation of your Lagrangian/particle definitions

Cheers,

Olivier

> On 24 Apr 2021, at 15:20, Siddharth <email address hidden> wrote:
>
> Question #696697 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/696697
>
> Status: Answered => Open
>
> Siddharth is still having a problem:
> As I have generated the UFO through SARAH, I couldn't figure out the
> points you raised. I have attached the link of my UFO, Can you please
> let me know where should I search for the error?
>
>
> https://drive.google.com/drive/folders/1a1luv51Q1rIXnTJF4s2QtnKuvdzuU18O?usp=sharing
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Revision history for this message
Siddharth (siddharthprasad) said : 		#4

Thanks Olivier Mattelaer, that solved my question.