Pythia 6/8 unable to shower events produced by MG5 with eps_ijk color vertex
Hi there,
I'm attempting to generate and decay events in MG5 and pass them to Pythia for showering and hadronization. The model contains a color triplet scalar with an eps_ijk color coupling to quarks. Event generation seems to go smoothly, and the .lhe files look reasonable. Using the built-in pythia-pgs package, I obtain the following error in the pythia.log: "(PYCTTR:) colour tag tracing failed".
Reading a similar question asked yesterday seemed to indicate that Pythia 6 can't handle this sort of vertex, and I should instead use Pythia 8. Upon using "output pythia8" in my proc_card, MG5 tells me that Pythia 8 can only handle up to 2 -> 3 processes, and I'm interested in a 2 -> 4 process.
My next step was to write code using the Pythia 8 library to read the unweighted lhe file with 'pythia.
Any thoughts? Thank you in advance, Chris
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