ValueError : String 1 T(-1003,-1001) T(-1003,-1001) T(-1002,-1000) T(-1002,-1000) cannot be simplified to a number!

Hi Jacky,

This is due to an incoherence of your model,
The issue is that FR does not have a clear definition of the 3/3bar representation
and what likely happen is that some of your quark are set in the wrong representation.

MG5aMC has some "recovery" mode for that (auto-switching representation) but you need to have all your fermion to couple to a color octet.

Hope this help.

Cheers,

Olivier

> On 11 Sep 2019, at 21:58, Jacky <email address hidden> wrote:
>
> New question #683863 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/683863
>
> Hi,
>
> I have a model containing three scalar particles (two leptoquarks and a diquark). From FR I could successfully generate the UFO.
> But when using this, I try to run the process d d > e- e- u u it is aborted with the error:
>
> Command "launch" interrupted with error:
> ValueError : String 1 T(-1003,-1001) T(-1003,-1001) T(-1002,-1000) T(-1002,-1000) 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.
>
>
> Interestingly, I could split the process into small processes and those work like a charm!
>
> For example, I could successfully run and calculate the rate for:
>
> generate d d > s3~
> generate s3~ > s1 s2
> generate s1 > u e-
> generate s2 > u e-
>
> Please have a look and let me know if you need more information to sort it out.
>
> Best regards,
> Jacky Kumar
>
>
>
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