Transient HepMcParticleLink objects can now be built using either
GenParticle::id() or the
GenParticle barcode Attribute as the unique ID for the particle.
HepMcParticleLink TP converters work for most use-cases. Some awkwardness for links to GenParticles that have been cut from the
McEventCollection, mostly in deciding whether the unique ID is a barcode or an id. The value is preserved though, so the links can still be used to group EDM objects linked to the same truth particle.
HepMcParticleLink_p3 - based on
GenParticle::id(). This works as well as the existing
InDetSimEventTPCnv package to work with the updated transient HepMcParticleLink class.
Still need to update other clients.