Difference between revisions of "Software"

Revision as of 06:27, 16 December 2021

This provides a very brief overview of the data to paper processing pipeline.

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)