|Message: Primary Vertex Information to Track Information, and question about multiple parent tracks||Not Logged In (login)|
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I am currently running a calorimeter simulation in Geant4 using HepMC event records as the input. (The HepMC event record is produced by a Pythia generator, separate to my simulation.)
My goal is to record which HepMC GenParticle each track originated from. As far as I can tell, I could modify the existing PrimaryTransformer class (and the EventManager class), so that it takes UserPrimaryVertexInformation and converts it into UserTrackInformation, attaching it to the corresponding produced tracks. Is there a better way to do this?
My second question is regarding the ParentID of a track that is produced at the interaction vertex of two or more particles, for example e+e- annihilation. For each of the two gammas produced by e+e- annihilation, you could consider either the e+ or the e- track as the "parent track". How does Geant4 decide which track to assign the gamma track? In other words, if I called the GetParentID() method for one of the gamma tracks, which TrackID would it return, the e+ or the e-?
Thanks in advance for your help.
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