What is the meaning of JAMP in model check?

Asked by Radha Mastandrea on 2021-03-16

I am working with a custom model, and I noticed the tests for Lorentz symmetry fail with output

Lorentz invariance results:
Process Min element Max element Relative diff. Result
u d > g u d 1.8314808473e-03 3.1517538028e-03 4.1890104309e-01 Failed
   JAMP 0 4.9656585728e-04 6.9200039043e-04 2.8241968625e-01 Failed
   JAMP 1 1.6242153374e-03 3.0286479560e-03 4.6371603404e-01 Failed
   JAMP 2 4.0973248992e-03 6.9567139198e-03 4.1102581672e-01 Failed
   JAMP 3 2.5353124719e-05 4.4866159208e-05 4.3491653472e-01 Failed

What is "JAMP" here? I also see it referenced on this site (http://cp3.irmp.ucl.ac.be/~quertenmont/TEMP/MG_VBF_ZZ/MadGraph5_v1_4_8/apidoc/madgraph.various.process_checks-pysrc.html) but there's no definition of the term.

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Last query:
2021-03-16
Last reply:
2021-03-16

Those are color-ordered amplitude:
https://arxiv.org/pdf/hep-ph/0209271.pdf

Cheers,

Olivier

> On 16 Mar 2021, at 17:50, Radha Mastandrea <email address hidden> wrote:
>
> New question #696092 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/696092
>
> I am working with a custom model, and I noticed the tests for Lorentz symmetry fail with output
>
> Lorentz invariance results:
> Process Min element Max element Relative diff. Result
> u d > g u d 1.8314808473e-03 3.1517538028e-03 4.1890104309e-01 Failed
> JAMP 0 4.9656585728e-04 6.9200039043e-04 2.8241968625e-01 Failed
> JAMP 1 1.6242153374e-03 3.0286479560e-03 4.6371603404e-01 Failed
> JAMP 2 4.0973248992e-03 6.9567139198e-03 4.1102581672e-01 Failed
> JAMP 3 2.5353124719e-05 4.4866159208e-05 4.3491653472e-01 Failed
>
> What is "JAMP" here? I also see it referenced on this site (http://cp3.irmp.ucl.ac.be/~quertenmont/TEMP/MG_VBF_ZZ/MadGraph5_v1_4_8/apidoc/madgraph.various.process_checks-pysrc.html) but there's no definition of the term.
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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