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ATLASRECTS-7033: Produce final xAOD::Truth from TruthEvent (no GEN_AOD).

Christos Anastopoulos requested to merge ATLAS-EGamma/athena:Truth_CA_RecEx into master

ATLASRECTS-7033: Produce final xAOD::Truth from TruthEvent (no GEN_AOD).

Still leave the creation of the EtaPt filtered GEN_AOD and SpclMC in the old style RecExCommon .

This makes the TruthParticles , TruthEvents etc be the same between old (RecExCommon) and new config (CA).

The difference is coming from creating them from the EtaPt thinned MC input (GEN_AOD) or the Full (TruthEvent).

(The filter is this https://acode-browser1.usatlas.bnl.gov/lxr/source/athena/PhysicsAnalysis/TruthParticleID/McParticleTools/src/EtaPtFilterTool.cxx#0061). Given we now do GeantTruthThinning and we do not pile-up truth the diff in size in q443 at least does not seem great.

Anyhow this is one way to handle the discrepancies. I added some comments on what happens in the old config. Alternatively we need to add the filter TruthEvent->GEN_AOD step in the CA .

Edited by Christos Anastopoulos

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