MadGraph5_aMC@NLO

Understanding impact of group_subprocesses on the diagrams generated

Asked by Jay Vora

Dear Olivier,

I am using the LO S1 LQ model from here [1]:

I get 19 diagrams when I generate the following:
b b > top tau top tau QCD = 2, QED = 2, NP == 2

I get 1 diagram when I generate the following:
b b > top tau top tau QCD = 2, QED = 2, NP == 4

And I get 20 diagrams when I generate the following:
b b > top tau top tau QCD = 2, QED = 2, NP >0

I can see the total number of diagrams when I open "launch.html" and go to "process information". But when I open the actual diagram files, I can only see a maximum of 12 diagrams (2 pages) for each subprocess.

Now if I repeat the entire exercise but this time use "set group_subprocesses False", I still get the same number of diagrams listed in the "launch.html" file. however, I can see all 19 and 20 diagrams in the jpg files.

Is this discrepancy because madgraph is not displaying everything in the jpg files or does group_subprocesses alter the diagrams being generated?

Best,
Jay Vora

[1] https://lqnlo.hepforge.org/

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

Yes the conversion of the eps format to the jpeg format is something which can be extremely slow, so indeed to avoid that we do limit the number of diagram converted to jpeg. I thought the limit was the same with an without group_subprocess but clearly you showed me that it was not the case.

If you want to be sure please open the eps file where all diagram are included.

Cheers,

Olivier

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Jay Vora (jvora123) said : 		#2

Thanks a lot Olivier, I can indeed see the full set of diagrams in eps format.