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

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

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EVIO data files are converted to LCIO Data Format events using the EvioToLcio command line utility.
The and within the same process, the HPS Java reconstruction is run to produce physics object collections.Event skimming using filters is performed in separate EVIO to LCIO jobs.
The recon LCIO is converted to ROOT DST Data Format so that the events can be easily analyzed in ROOT.
DQM files containing plots in ROOT or AIDA format may also be produced from analyzing the reconstruction output.

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Java Package	Description	Notes	Module
org.hps.evio	converts EVIO raw data to LCIO		evio
org.hps.recon.ecal	ECal reconstruction utilities	primarily for converting from raw data to CalorimeterHits	ecal-recon
org.hps.recon.ecal.cluster	ECal hit clustering framework	includes recon clustering and GTP/CTP hardware emulation clusterers	ecal-recon
org.hps.recon.tracking	track reconstruction from SVT hits		tracking
org.hps.recon.tracking.gbl	GBLtrack refit	ported from C++ to Java	tracking
org.hps.recon.particle	builds ReconstructedParticles from tracks and clusters		recon
org.hps.recon.vertexing	vertex reconstruction		recon
org.hps.recon.filtering	event skimming utilities		recon
org.hps.record.*	utilities for various data types (DAQ config, SVT, etc.)		record-util
org.hps.analysis.dataquality	Data Quality Monitoring plots	run on reconstruction output	analysis

Drivers

EVIO Data Conversion

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The EvioToLcio utility converts EVIO to LCIO

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using an LCSimEventBuilder implementation such as LCSimEngRunEventBuilder. The generated LCIO events can then be optionally written to disk using

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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.