Different number of real emission diagrams between 2.9.x and 3.3.x
Dear Madgraph5 experts,
I found that the xsec of diphoton process is significantly different between version 2.9.x and 3.3.x (with Marco's patch to make it run).
https:/
While digging into the issue, I've observed that there is a difference in the number of real emission diagrams in the first place between the two versions. For example, if I do
import model loop_sm-no_b_mass
generate p p > a a [QCD] @0
add process p p > a a j [QCD] @1
then for the process 'p p > a a j [QCD]' (without jet it gives the same diagrams), I get 30 subprocesses with 5050 real emission diagrams, 180 born and 2340 virtual in 2.9.x, but 30 subprocesses with 7400 real emission diagrams, 180 born and 2340 virtual in 3.3.x.
I was assuming they should be the same when we don't have any QED correction, so I was wondering whether there was any change in the logic to estimate the diagrams.
Best,
Sanghyun.
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- davide.pagani.85 Edit question
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