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titleWhat is a Driver?

In the context of LCSim and HPS Java, a driver is an event processing component that operates on each event in a record processing loop and may add new object collections to the event.  For example, a driver might convert ADC data to a hits collection or it could perform track finding and create new track object collections.

Before the drivers can process the data, it is converted from the The EVIO Data Format written by the DAQ by  is converted into LCIO by an LCSimEventBuilder such as LCSimEngRunEventBuilder.  The EvioToLcio command line tool reads EvioEvents with an EvioReader and then uses the an event builder on them to create LCIO events representing the raw data.  The driver chain is then run to perform the physics reconstruction which will add additional object collections to the event.  The combined events with the data and recon collections are written out to an LCIO file.  The LCIO output can be converted to ROOT DST Data Format for ROOT compatibility, or it may be loaded back into HPS Java for analysis. 

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