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Updating the PYTHIA filter used for gluon fusion off-shell Higgs using MCFM+JHUGen to use the MCMultiParticleMassFilter, which was introduced here: cms-sw/cmssw#45344.
Since MCFM+JHUGen gridpacks are separated by final state, this formulation of the PYTHIA filters separated by the 4-lepton final-state works for each given gridpack. You can see a presentation on this at an HZZ meeting here: https://indico.cern.ch/event/1433234/#38-mc-simulation-gluon-fusion.
There is no filter planned for tau decays - so electrons and muons will be the only ones with a filter applied. For tau decays, simply use the fragment without a filter (
GluGluToZZTo4L_TuneCP5_13p6TeV-MCFM-jhugen7.5.2_nofilter.py
).