wrong color flow assigned for the interference terms in unweighted_events.lhe
Dear Madgraph team,
I am working on a new model, which essentially has only one vertex (g-g-X, where X is a new massive color singlet scalar with mass of 750 GeV (say)) in addition to the SM vertices. I want to plot/study the differential cross sections with respect to the invariant mass of 2 jets in the final state for the resonance + interference between g g > X > g g (resonance) and g g > g g (pure QCD) at the detector level (i.e. after the events are passed through Delphes). The goal is to study the effects of the interference between the QCD and resonance contributions; ultimately I want to do this at NLO, but for now I'm just trying to get the LO to work.
As a first step, I plotted d sigma/d (mjj) at parton-level obtained from unweighted_
The reason I had thought this might have worked is that the "help generate" message gives the example of "generate p p > j j QED^2==2 QCD^2==2" to select the QED-QCD interference terms only. For this process, I do get pythia8_
So, to get detector level events in my case (i.e. interference between g g > X > g g (resonance) and g g > g g (pure QCD) ), I wrote a shell script which changes the zeroes in the color flow entries in the unweighted_
Finally, is there a fix for the wrong color flow assignment for the interference terms in the unweighted_
Please let me know if anything is needed from my end.
Thank you very much!
Cheers,
Prudhvi
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- Olivier Mattelaer
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