Tau classification
It would be good to distinguish in the truth labelling between 1- and 3-prong tau. We should check how the tau group does this.
It looks like there is already similar information in the form of the TauDecayLabel
, but from a quick glance I think this is only considering taus from HF decays. So we would need to add a second label with similar logic that looks at taus not from HF decays, but this should be a simple change.