sPHENIX is a new detector at RHIC.

[Anthony Frawley <afrawley AT fsu.edu>]

I am following up on the discussion we had in the Upsilon TG meeting this morning about tagging electrons.

One possibility is to use a multimap on the node tree to record all associations of tracks with particle ID's. The multimap could look like:

std::multimap<particle_type_key, track_index>

where the key would be particle type (electron, pion, ......). This would allow us to look up all tracks with a given particle type using a single line of code.

Every PID module would just add an entry every time it accepts a track. Tracks would have entries corresponding to every particle ID associated with them.

Analysis modules would be able to obtain a list of all tracks accepted by a given PID module by using multimap::equal_range(particle_type_key). The tracks could then be accessed directly from the track map.

Tony