Unexpected result for total decay widths near a threshold
Dear MadGraph team,
We would like to understand some results we are obtaining for the total width of a sterile neutrino within the context of a new physics model. This sterile neutrino couples to the W/Z bosons and SM leptons, therefore the dominant decay modes are 1>3 or 1>2, depending on the sterile neutrino mass allowing for the W/Z to be on-shell or not.
When we plot the total width of the sterile neutrino as a function of its mass, we expect to observe bumps at the W and Z masses, as 2-body decays become available. Instead we are obtaining dips at both values.
We were wondering how reliable are MadGraph/MadWidth results near this threshold, i.e. when 3-body decay processes are replaced by 2-body decays.
Thanks in advance,
Santiago
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