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use HLT tau vertex instead of beamspot in the TauTrackFinder + adding HypoTool monitoring histograms

Antonio De Maria requested to merge vx_tautrkfinder into master

This MR is :

  • use the HLT tau vertex to get the impact parameter variables in the TauTrackFinder
  • use the beamspot as backup solution (not as default) in case the HLT tau vertex in not found

This will uniform the calculation of the impact parameter variables and the the track-flight path sgn variable used in TauID -> use HLT tau vertex in both cases

This change is also impacting trigger counts

tagging @martindl, @sutt and @jmasik since this is part of the discussion we started about the usage of the HLT tau vertex in the HLT tau reconstruction.

tagging also @iriu and @carquin from tau trigger side

Adding also monitoring histograms for the TrigEFTauMVHypoTool and TrigTrackPreSelHypo-> histograms will appear in online monitoring (tested locally)

Edited by Antonio De Maria

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