BSM Processes with tree + loop diagrams
Dear authors,
I am trying to generate g g > z z with an NLO UFO that contains a BSM particle X, such that the process happens at 1-loop in the SM (via boxes plus the Higgs diagram ) and at tree level in the BSM contribution gg > X > zz.
I was wondering if there is any way to include both classes of diagrams in the same event generation.
and if yes, is there any chance of isolating the interference term between BSM tree and NLO SM?
The BSM couplings have an interaction order NP but no QCD or QED.
So far I have verified that I can produce
* BSM tree alone with g g > z z NP=2
* SM 1-loop alone with g g > z z NP=0 [QCD]
* SM + BSM 1-loop only, with g g > z z QED=2 NP=2 [noborn=QCD]
* BSM tree + BSM 1-loop + SM NLO with real emissions, but without SM boxes and Higgs contributions, with g g > z z NP=2 [QCD]
however, the event generation of this process crashes due to poles not canceling
I have also looked at the twiki page https:/
I implemented the modifications needed, patched my model with prepare_
g g > z z BKG_NP=2 NP=2 QED=2 QCD=2 [noborn=QCD BKG_NP] BKG_NP^2==2
still, I wasn't able to figure out a syntax that can give me BSM tree + SM 1 loop diagrams without extra jets.
Is this really impossible in MG, or am I missing something?
Thank you very much in advance!
Ilaria
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