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Add TrackTruthDecoratorAlg

Samuel Van Stroud requested to merge (removed):master-trackTruthDecoratorAlg into master

Similar to !51627 (merged), this adds an algorithm which decorates tracks with truth information. Two variables are added

  • truthOriginLabel which is an in integer origin defined here.
  • truthVertexIndex which is an integer label for the truth vertex from which the track originated. A value of 0 is reserved for the truth PV, while other truth vertices in the event are indexed arbitrarily after sorting the tracks according to their pT. Truth vertices within a configurable distance (by default set to 0.1mm) are merged.

This moves functionality from the FTAG Training Dataset Dumper to speed up jobs. See atlas-flavor-tagging-tools/training-dataset-dumper#36 (closed) Jira: AFT-596

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