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Draft: Update/Cleanup of the TrigTauRec package

Jean Yves Beaucamp requested to merge jbeaucam/athena:24.0-hlt-tau-rec into 24.0

This MR addresses the cleanup/documentation of the TrigTauRec package, in preparation for the HLT GNTau implementation. This is part of a series of MRs that will be undrafted sequentially.

No HLT Tau Triggers will be used in the low-mu pp or HI data-taking runs, so we can open these MRs now, which are needed before we start validating the new HLT GNTau.

Amongst the most important changes, we can list:

  • Cleanup of the TrigTauRecMerged algorithm:
    • Better separated the calo-only reconstruction (for the CaloMVA step), and the xAOD::TauJet-seeded reconstruction (for the Precision step).
    • Removed some unused skeleton code from previous versions. This is a much better clean slate for the soon-to-come changes (3-step tracking, preselections, etc...).
    • Added support for monitoring multiple TauId scores.
  • Updated online TauID score monitoring histograms:
    • The histograms' names have been overridden to be the same as in the current Athena release to allow for an HLT Reprocessing validation round with complete reference comparisons.
    • After the changes are validated, we'll update the histogram names.
  • Moved HLT TauID config flags to sub-directories:
    • Each algorithm will have a dedicated sub-directory for it's configuration
    • The required LVNN-based or ONNX-based (coming soon in the HLT GNTau MR) infrastructure is automatically loaded and configured based on the config-flags for each algorithm. This allows for quick testing and deployment of new algorithms!
  • Moved the TrigTauCaloRoiUpdater and TrigTauTrackRoiUpdater algorithms from the TrigTauHypo to the TrigTauRec package, since they are not hypothesis algorithms or tools (this caused some confusion in the past to newcomers).
  • Added a README.md, and descriptive comments to the configuration code of the package.
  • General code linting.

The changes were validated by comparing event counts and online/offline monitoring histograms for 10k mc23e ttbar/g*tautau/Ztautau events.

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