From GlueXWiki
Revision as of 11:19, 3 March 2022 by Zihlmann (Talk | contribs)

Jump to: navigation, search

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 by the DAQ system in the EVIO file format and processed using programs in halld_recon. More details to EVIO file format can be found HERE (Mark)
  • There are three main databases in HallD, RCDB, CCDB and HOSS. A detailed description of these can be found HERE. (Naomi, Sean, David L.)
  • hd_root is used to analyse EVIO(see above) and REST ( THIS NEEDS LINK)data with plugins for monitoring, Calibrations, and event reconstruction (Sean [calibrations] - & 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)
  • Detector Geometry: needed for real data and MC data reconstruction. The Detector Geometry is described in xml format and can be translated into other formats.
  • 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 to matche the MC simulation results with actual measurements. (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. The basic ideas and steps are outlined here(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. (Alex A)

Analysis Tree analysis

  • DSelectors are used to analyze "Analysis Trees" (see reaction filter above) to generate histograms of invariant masses, angular distributions and more. It can also generate highly reduced output trees for further analysis reducing the I/O. See Analyze an Analysis Tree for more details. (Beni)
  • FSRoot is an alternative to DSelectors that uses flat trees. (Ryan)
  • AmpTools (GitHub, User Guide) is used for partial wave analysis. GlueX specifics are documented here (PRIVATE) (Malte)
  • PyPWA is an alternative software package to perform an amplituded analysis based on python. Documentation details can be found here (Carlos, Maj)