Associate parent truth particle to measurements by index.

Currently the measurements converted to xAOD are associated to truth particles via the truth particle barcode. However, the latter is not unique in full truth pileup samples. Since all truth particles are added to a single xAOD container the truth particle index can be used as a unique identifier. Since the barcode serves as a second purpose to identify geant4 created truth particles the barcodes are kept and the indices are added as an additional decoration. The decoration is optional and can be turned off by not providing a truth link container.

This impacts the technical efficiency reported by InDetPhysValMonitoring when full truth pileup samples are used.

added bugfix label

This merge request affects 3 packages:

• InnerDetector/InDetConfig
• InnerDetector/InDetEventCnv/InDetPrepRawDataToxAOD
• InnerDetector/InDetValidation/InDetPhysValMonitoring

Affected files list will not be printed in this case

Adding @stsuno ,@jburzyns ,@battagl ,@tstreble ,@lshan ,@sroe ,@lgagnon ,@bkerridg ,@keli ,@goetz as watchers

added InnerDetector main review-pending-level-1 labels

changed the description

removed InnerDetector main review-pending-level-1 labels

CI Result SUCCESS (hash 2a2532b9)

	Athena	AthSimulation
externals
cmake
make
tests

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For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 6537] (remote access info)

added InnerDetector main review-pending-level-1 labels

FYI @sargyrop @rkusters as this might help for your trackless b-tagging studies

mentioned in merge request atlas-flavor-tagging-tools/training-dataset-dumper!526 (closed)

MR looks good to me thus approving - L1 shifter

removed review-pending-level-1 label

added review-approved label

merged

mentioned in commit 754b522d

mentioned in merge request !78699 (merged)