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Hello, This MR is harmonising the use of tau track IP and IP significance parameters across the tau reconstruction. We now use everywhere the impact parameters w.r.t. the tau vertex instead of w.r.t. beam line (relevant for d0). New methods are introduced to retrieve the track IP and IP significances directly from the tau track (before, we would use e.g. d0 from the associated TrackParticle, i.e. d0 w.r.t. the beam line). Because we need track IPs early in the reconstruction (right after tau vertex finding and tau track association, and before tau track classification), I had to move the track IP calculation from TauVertexVariables to TauTrackFinder, as TauVertexVariables is scheduled late in the reconstruction chain. Two variables have been discontinued: TauJetsAux.ipSigLeadTrk TauJetsAux.ipZ0SinThetaSigLeadTrk. These are track IPs defined for the leading track. Now that we compute these for all tau tracks, we can drop these "leading track" v...
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