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Depending on the tool being used, steering files may also be accessed as XML files on disk.
Data Conversion
The EvioToLcio utility converts EVIO to LCIO using an LCSimEventBuilder implementation such as LCSimEngRunEventBuilder. The generated LCIO events are then optionally written to disk using an LCIODriver. The physics reconstruction may also be run in the same process for efficiency.
SVT data banks are handled by an SvtEvioReader and converted into RawTrackerHit and GenericObject collections.
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The default builder will also convert and write DAQ config information, EPICS data, and scaler bank data into the output LCSim events, if these banks are present in the EVIO data.
TODO: put list of collections created by the converter
Track Reconstruction
These are the steps in the HPS Java track reconstruction:
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The tracking packages in lcsim form the basis for HPS's tracking algorithms through usage and extension. Seed Tracker is used for track finding using a set of input tracking strategies. The track fit from lcsim is further refined using a Java implementation (port) of the GBL C++ algorithm.
TODO: put list of tracking input/output collections here
ECal Reconstruction
These are the basic steps of the ECal reconstruction:
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The copied collection will be updated with corrected energies in the next step which creates recon particles.
TODO: put list of ECal recon input/output collections here
Reconstructed Particles
The ReconParticleDriver creates ReconstructedParticle objects representing the final state particles from the event reconstruction. These are tracks with matching clusters (when applicable). It also performs vertex reconstruction and creates a number of candidate particle collections.
The ReconParticleDriver is sub-classed by the actual HpsReconParticleDriver from the steering which adds Moller candidate collections.
TODO: put list of recon particle input/output collections here
Java Packages
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
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HPS Java Reconstruction Packages
| Java Package | Description | Notes | Module |
|---|---|---|---|
| org.hps.evio | converts EVIO raw data to LCIO | evio readers for converting EVIO raw data to LCIO events | 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 | based on Seed Tracker from lcsim | tracking |
| org.hps.recon.tracking.gbl | GBLtrack refit | ported from C++ to Java; actual Java package now outside HPS Java | tracking |
| org.hps.recon.particle | builds ReconstructedParticles from tracks and clusters | builds reconstructed particles from input event collections | recon |
| org.hps.recon.vertexing | vertex reconstruction | based on Billoir vertexing algorithm | recon |
| org.hps.recon.filtering | event skimming utilities | recon |
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These lcsim packages are used extensively in within the HPS Java reconstruction code.
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