sPHENIX tracking discussion

[David Stewart <0ds.johnny AT gmail.com>]

Hi all,

I am implementing a loop that ideally will iterate according to the following pseudocode:

outer_iterator : PHG4Particle* over all embedded truth particles  per event {

   inner_iterator : PHG4Hit* per PHG4Particle {

   }

}

I have found the iterator to get the embedded track ids from the PHG4TruthInfoContainer node; and a function to fetch the associated PHG4Particle* and check if they are primary. However, I cannot find in sPHENIX's coresoftware any map on the node tree that links the PHG4Hit's to the PHG4Particle's, other than the fact that they both independently store the associated TrackId numbers. (For example: the evaluators' that check for connection simply return PHG4Hit->get_trkid() == PHG4Particle->Get_track_id()).

Does such a mapping exist to directly iterator over; or must I iterator over all the PHG4Hit's and pick them out as they come along?

Thanks very much,

Dave

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David Stewart

Postdoctoral Fellow | Department of Physics, Wayne State University