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tauRecTools: use consistent treatments of vertex correction (ATLTAU-1716)

Xiaozhong Huang requested to merge xiaozhon/athena:VertexCorrectionTool into master

Below is a brief summary.

A. In offline reconstruction:

The four momentum of jet constituents is corrected to point at PV0 in jet reconstruction. To improve the vertex selection efficiency, we use TJVA to select the tau vertex, which maybe different from the default one. The way how to correct to point at the tau vertex depends on the objects we want to correct.

  • constituents of Topo/PFlow jets: Constituents of jets are corrected to point at PV0. In tau reconstruction, we should use the relative position of the tau vertex and PV0 to perform the correction. Previously, we use the position of the tau vertex, which is not right.

  • clusters in PFlow objects: Clusters in PFlow objects are not corrected in the jet reconstruction. In tau reconstruction, we should use the tau vertex to perform the correction directly.

In various tools in tau reconstruction, we need to select clusters within dR (0.2 or 0.4) of the tau axis. The vertex correction is not applied consistently to the clusters and tau axis. Sometimes tau axis is corrected to point at tau vertex, but the clusters is corrected to point at PV0 or not corrected at all. This behavior is now fixed.

B. In online reconstruction:

If the seed jet is PFlow, the tau axis will be corrected to point at PV0, but the clusters in the PFlow objects will not be corrected. This need to be fixed later if needed.

Edited by Xiaozhong Huang

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