Software
From GlueXWiki
This page provides a very brief overview of the GlueX-specific software used between recording data and publishing results.
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 is used for partial wave analysis (Malte)