Use isGenStable from TruthUtils inside the TruthParticle class

Andrii Verbytskyirequested to merge
averbyts/athena:movegenstable into 23.0
  • Use isGenStable from TruthUtils inside the TruthParticle class
  • Simplifications in the HepMCHelpers.h
Edited by Andrii Verbytskyi

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