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tauRecTools: add track impact parameters w.r.t. tau vertex (ATLTAU-1718)

Bertrand Martin Dit Latour requested to merge martindl/athena:R22_TauTrackIPdecor into master

Hello,

This MR is a follow up of !36099 (merged) that had introduced track IP significances w.r.t. the tau vertex. In this MR, we add the track IP w.r.t. the tau vertex, and rename the IP significances to make it explicit these are w.r.t. the tau vertex ("_TV"). At the moment, these variables are just added as decorations onto the tau tracks, but we may consider making them part of the tau track EDM. We are still investigating why z0sintheta_TV (from TrackToVertexIPEstimator) is sometimes identical to tau.track()->z0sinThetaTJVA(tau), and sometimes not (the difference comes from the z0 part, it seems sintheta is identical in the two calculations). Tracked at ATLTAU-1732.

Cheers, Bertrand

Edited by Bertrand Martin Dit Latour

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