requested to merge jchapman/athena:PileUpTruthDecoration_ATLASSIM-3837_21.0 into 21.0
This MR is part of work for ATLASSIM-3837. For the Run 2 reprocessing the FilterHit step will run in 21.0.X, hence the need to push the changes to this branch. There are two sets of changes in this MR:
- Decorate pile-up Truth Particles and Pile-up Truth Jets with the primary vertex Z position as this information is not saved to the RDO file.
- Ensure that
AntiKt6TruthJetsas well as