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Add track IP significance for all tau tracks

Bertrand Martin Dit Latour requested to merge martindl/athena:R22_IPsig into master

Hello,

This MR adds the d0 and z0sintheta IP significance parameters (w.r.t. the tau vertex offline, and w.r.t. the beamspot online) as decorations onto the tau tracks. As discussed in ATLTAU-1718, we expect these variables to be useful in the NN track classifier. So far, we were storing this information only for the leading track. For the trigger, the use of the beamspot may have to be revisited, it would be more relevant to use the HLT tau vertex when one is found.

The new variables appear in the xAOD as expected:

checkFile AOD.pool.root  | grep TauTrack | grep IPsig
      35.118 kb       30.520 kb        0.153 kb        0.000      200  (B) TauTracksAuxDyn.z0sinthetaIPsig
      35.056 kb       30.613 kb        0.153 kb        0.000      200  (B) TauTracksAuxDyn.d0IPsig

Cheers, Bertrand

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