GlueX Data Classes

Generated Particles and Reconstructed Detector Data

• NOTE: These are the objects stored in REST files.
• NOTE: These definitions are spread throughout sim-recon/src/libraries/
• DMCThrown: The generated particles for the event.
• DBeamPhoton: The generated beam photon for the event.
• DTrackTimeBased: The particles reconstructed from time-based tracking. One DTrackTimeBased object is created per PID hypothesis (defaults are π⁺, K⁺, and p for positively charged tracks, and π^-, K^- for negatively charged tracks).
• DBCALShower: The reconstructed showers in the barrel calorimeter.
• DFCALShower: The reconstructed showers in the forward calorimeter.
• DTOFPoint: The reconstructed hit in the time-of-flight scintillators.
• DSCHit: The raw detected SC hit.
• DMCReaction, DMCTrigger, and DTaggerHit: These are currently unused by the analysis framework.

Reconstructed Particles and Particle ID

• NOTE: These are located in sim-recon/src/libraries/PID/
• DBeamPhoton_factory: Currently just reads the generated DBeamPhoton objects in from the hddm file.
• DEventRFBunch_factory: Selects the RF bunch corresponding to the event by matching the DTrackTimeBased objects to TOF/BCAL/ST hits, and those hits to the measured RF time. More details on RF bunch selection are located at: RF Beam Bunch Selection & PID Details
• DChargedTrackHypothesis_factory: Creates a DChargedTrackHypothesis object for each DTrackTimeBased object (one per PID hypothesis, can be more than one per particle). When creating the DChargedTrackHypothesis objects, the tracks are matched to hits in the SC, BCAL, FCAL, and TOF, and the PID FOM is calculated (from TOF and DC dE/dx). More details on Particle ID are located at: RF Beam Bunch Selection & PID Details
• DChargedTrack_factory: Creates a DChargedTrack object for each reconstructed charged particle. These contain all of the DChargedTrackHypothesis objects associated with this particle.
• DNeutralShower_factory: Creates a DNeutralShower object for each DBCALShower and DFCALShower object that is not matched to any of the DChargedTrackHypothesis objects.
• DNeutralParticleHypothesis_factory: Creates two DNeutralParticleHypothesis objects for each DNeutralShower: a photon and neutron. The particle vertex is assumed to be the center of the target.
• DNeutralParticle_factory: Creates a DNeutralParticle object for each reconstructed neutral shower. These contain all of the DNeutralParticleHypothesis objects associated with this particle.