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Porting Pixel Space Point formation from 21.9 to master (ATLIDTRKCP-172)

Noemi Calace requested to merge ncalace/athena:master-porting-pixel-sp-production into master

@gavrilen has done code improvements to speed up the Pixel Space Point formation by about a factor 4-5 in 20.20 with ttbar events at 200 pileup. These improvements, already ported to 21.9, are now ported to master.

The main changes are:

  • evaluation of the cluster global position and covariance multiplying directly quantities of its local position and covariance. This avoid evaluating the cluster global position using clus->detectorElement()->surface().localToGlobal(clus->localPosition()) which is very time consuming.
  • implementation of a new constructor for PixelSpacePoint to use directly the global position and the covariance evaluated as mentioned above.
Edited by Noemi Calace

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