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This page provides a very brief overview of the GlueX-specific software used between recording data and publishing results. In time, it should become populated with links to more detailed documentation.

Raw and reconstructed data – halld_recon

  • Raw data is saved in the EVIO file format and processed using programs in halld_recon. (Mark)
  • There are two main databases:
    • Run conditions (e.g. beam current, radiator) are stored in RCDB (web interface)
    • Calibrations and other parameters used in reconstruction/analysis are stored in CCDB (web interface).
  • hd_root is used to analyse EVIO and REST data with plugins for monitoring, Calibrations, and event reconstruction (Mark)
  • REST files are an HDDM format which stores reconstructed physics objects (no detector hit information) (Richard)

Simulated data - halld_sim

  • Simulated data are in HDDM format. (Richard)
  • Event generators generate simulated physics data (particle, momentum, track angle) (Simon & Malte)
  • hdgeant4 models the measurements (detector hits) produced by those tracks (Richard)
  • mcsmear models the detector resolution which makes the measurements less exact. (Richard)
  • MCWrapper runs the above on demand. (Sean)

Reaction channel analysis

  • ReactionFilter plugin is used to find the events corresponding to a particular reaction to make Analysis Trees. (Beni)
  • Requests for analysis trees are collected via a webpage, and launched bundled together on the JLab farm. Lists for already existing trees are kept here.

Analysis Tree analysis

  • DSelectors are used to analyze "Analysis Trees" (see reaction filter above) to generate histograms of invariant mass etc. and highly reduced output trees. (Beni)
  • FSRoot is an alternative to DSelectors that uses flat trees.
  • AmpTools (GitHub, User Guide) is used for partial wave analysis. GlueX specifics are documented here (PRIVATE) (Malte)