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Overview

The physics reconstruction is implemented in the HPS Java project, which uses extensively the org.lcsim framework.

A set of lcsim Drivers are used to process the raw data and produce collections of Tracks, Clusters, and ReconstructedParticles.

Quick Steps

  1. EVIO data files are converted to LCIO events using the EvioToLcio command line utility.
  2. The HPS Java reconstruction is run to produce physics object collections.
  3. The recon LCIO is converted to ROOT DST Data Format so that the events can be easily analyzed in ROOT.
  4. DQM files containing plots in ROOT or AIDA format may also be produced from analyzing the reconstruction output.

Package Documentation

The HPS Java Documentation can be used to browse the packages and classes used for physics reconstruction.

 The following packages are related to physics reconstruction in HPS Java.

Java PackageDescriptionNotesModule
org.hps.evioconverts EVIO raw data to LCIO evio
org.hps.recon.ecalECal reconstruction utilitiesprimarily for converting from raw data to CalorimeterHits ecal-recon
org.hps.recon.ecal.clusterECal hit clustering frameworkincludes recon clustering and GTP/CTP hardware emulation clusterersecal-recon
org.hps.recon.trackingtrack reconstruction from SVT hits tracking
org.hps.recon.tracking.gblGBLtrack refitported from C++ to Javatracking
org.hps.recon.particlebuilds ReconstructedParticles from tracks and clusters recon
org.hps.recon.vertexingvertex reconstruction recon
org.hps.recon.filteringevent skimming utilities recon
org.hps.record.*utilities for various data types (DAQ config, SVT, etc.) record-util
org.hps.analysis.dataqualityData Quality Monitoring plotsrun on reconstruction outputanalysis
    
    

 

EVIO Data Conversion

The EvioToLcio utility converts EVIO to LCIO using an LCSimEventBuilder implementation such as LCSimEngRunEventBuilder.  The generated LCIO events can then be optionally written to disk using an LCIODriver.  The physics reconstruction may also be run in the same process.

SVT data banks are handled by an SvtEvioReader and converted into RawTrackerHit collections.

Various modes of EVIO TDC data from the ECal are converted using the EcalEvioReader.

 

Event Reconstruction Steering Files

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