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Re-cluster Pflow substructure with ghost-tracks ANALYSISTO-761

Federica Fabbri requested to merge ffabbri/athena:FF_PflowTrackJetsSubstructure into 21.2

The changes are to obtain the substructure of Pflow reclustered jets using ghost associated traks, as described in ANALYSISTO-761.

  • I changed TopEvent/*/RCJetMC15.cxx(h) to introduce the alternative definition of substructure for PFlow Jets.
  • ParticleLevelRCJetObjectLoader.cxx to define a sub-structure only charged for particle level jets if PFlow jets are used at reco level.
  • I added a variable in the EventSaverFlat ntuple: the number of constituent used to calculate the substructure of a reclustered jet.

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