MadGraph5_aMC@NLO

Aloha output file extension?

Asked by Radha Mastandrea on 2020-11-24

I am trying to create aloha output files for the FFV1 lorentz structure, but the output of the files doesn't seem to be consistent -- namely, the output file

"output aloha FFV1_0 --format=Fortran"

looks very different to the file

 "output aloha FFV1_1 --format=Fortran"

in that the file with the extension _0 is a lot simpler, and seems to be actually calculating the vertex associated with the Gamma matrix. The output of FFV1_1 seems to include a propagator term. Does the file extension indicate the order of the process?

Question information

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MadGraph5_aMC@NLO Edit question
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Solved by:
Olivier Mattelaer
Solved:
2020-11-24
Last query:
2020-11-24
Last reply:
2020-11-24
Best Olivier Mattelaer (olivier-mattelaer) said : #1

Hi,

Did you check:
https://arxiv.org/pdf/1108.2041.pdf
you can check in particular the table A.10 page 20 which present you the analytical formula related to FFV1_0 ant to FFV1_1

You also have the definition of
FFV_0 in eq(1)
the one of
FFV_1 in eq(2)
the one of
FFV_2 in eq(3)
and the one of
FFV_3 in eq(4)

Cheers,

Olivier

Radha Mastandrea (rrm50) said : #2

The documentation helps a lot, thank you. From page 8 of the arxiv doc, I see that the extension _0 is for an amplitude and _i is the
"off-shell particle for a wavefunction routine" where the spinor is replaced by a propagator.

Radha Mastandrea (rrm50) said : #3

Thanks Olivier Mattelaer, that solved my question.