3-body decay contribution missing in the param_card
Dear Madgraph staff,
I am dealing with a model containing heavy quarks and interacting with SM particles with both gauge interactions (mediated by the SM vector bosons) and four-fermion contact interactions - six dimensional operator - that I implemented with Feynrules by defining an auxiliary gauge boson with very high mass and by imposing its propagator not to have momentum dependence (i.e. ~ 1/Maux^2).
To calculate the widths of these heavy quarks I set their widths to the value “Auto” as usual, but anyway, after the event generation I see only the two bodies contribution in the updated param_card, even if also the 3 bodies channels are expected to be relevant.
In fact by prompting “compute_width Heavy_quark —body_decay=3” I also see the 3 bodies channels with comparable partial widths to the 2 bodies case.
Is this something I should expect?
Best,
Matt
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- Olivier Mattelaer
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