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Changes to LLP1 for dHNL analysis

Sagar Addepalli requested to merge goblirsc/athena:LLP1-changes-dHNL into master

This MR adds features to LLP1 relevant to the displaced HNL analysis team. The main enhancements to the derivations are -

  • A lepton-only secondary vertexing algorithm is scheduled, and the corresponding variables are written to the container. To make use of the leptons reconstructed using LRT tracks, an 'on-the-fly' electron and muon merger is scheduled. The output view container from this merger is used by VSI. The merger by itself doesn't write any information to the DAODs since we use view collections.
  • A few variables for the tracks are added, with the addition of LRTGSFTrackParticles variables.
  • To explore the possibility of using standalone muons in vertexing and in the analysis, a few containers which contain the MS track information are added to the derivation. This is estimated to add about 2.6 kb/event to the derivation.

In addition, calorimetric isolation, which was previously missing for all LRT objects, is now scheduled thanks to @jdevivi.

Other than that there are some C++ changes to trackParticleMerger not changing the functionality.

Edited by Sagar Addepalli

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