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tauRecTools: use ghost-matching for tau-track association

Bertrand Martin Dit Latour requested to merge martindl/athena:R22_tauGhostTracks into master

Hello,

This MR is implementing a hybrid tau-track association that accepts all tracks within a cone of radius 0.25, and beyond 0.25, tracks are required to be ghost-matched with the seed jet. The ghost matching requirement prevents from using tracks from another tau (a situation that leads to very problematic behaviour in the tau substructure reconstruction, ATLTAU-1442). The motivations are explained in this talk.

The hybrid cone/ghost scheme is meant to replace the R=0.4 cone association, but it's currently disabled in tauRec.

I am adding the urgent flag because we need to validate the new scheme urgently and use it for the upcoming retuning of tau algorithms for the R22 reprocessing.

Cheers, Bertrand

Edited by Bertrand Martin Dit Latour

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