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Overview

The physics reconstruction is implemented in the HPS Java project, which uses org.lcsim extensively for basic utilities like event processing, detector description and conditions interfaces.

A set of lcsim Drivers is used to process the raw data and produce collections of Tracks, Clusters, and ReconstructedParticles.  The driver list is defined in an lcsim xml steering file read in by the lcsim job manager.  The drivers created by the manager are processed using the LCSimLoop, which is a sequential recording processing loop.

The job manager can read in lists of LCIO files as defined in the XML steering format or from command line options.  Post-processing or analysis of the recon can be done by reading in the LCIO files and supplying a steering file which implements the user's algorithm.

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.

HPS Java Reconstruction Packages

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
    
    

LCSim Packages

These lcsim packages are used extensively in the HPS Java reconstruction code.

Java PackageDescriptionNotesModule
org.lcsim.eventdefines physics event interfaces implemented by LCIOinterfaces used extensively in HPS Java Drivers 
    
    
    
    
    
    
    
    
    
    
    

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.

The following collections are added to the event by the ECal reader.

  • EcalReadoutHits
  • FADCGenericHits
  • EcalReadoutExtraDataRelations
  • EcalReadoutExtraData 

This builder will also convert and write DAQ config information, EPICS control data, and scalar bank data into the output LCSim events, if these banks are present in the EVIO data.

 

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