Page History

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• Event Generation:  
• MadGraph:  tridents & signal events 
• EGS5:  beam-target interactions (includes Mollers), wide-angle bremstralung 
• GEANT4:  hadrons from the beam-target interaction
• Detector Simulation: 
• slic (GEANT4 based)
• Readout Simulation: 
• hps-java (on slic output)
• Reconstruction: 
• hps-java (on readout output…give output, gives a recon .slcio file)
• dst-maker & lcio api (on recon output…gives gives a root file)
  

Currently, each step is performed in a separate batch job. The following event samples are made:

• "beam-tri":  simulates the beam going though the target; the “tri” refers to trident events that are inserted at the expected rate.  This is intended to be an unbiased representation of our data
• “tritrig-beam-tri”:  the “tritrig” refers to a sample of tridents that are preselected (at the MadGraph level) to be more likely to be in the detector acceptance and pass the trigger cuts so that we can efficiently get a large sample. These then have “beam-tri” overlaid in order to simulate what trident events look like in the detector. 
  
• "wab-beam-tri": beam-tri with wide-angle bremsstrahlung events mixed in.
  
• “ap” and “ap-beam-tri”:  the “ap” stands for “A prime” and is our signal MC…they MC. They can be generated at a given mass and decay length (ctau), and are produced with and w/o beam overlay (mostly with).  
• "moller" pure moller events. Note: beam backgrounds already contain moller events. "moller" is intended to be used for specialized studies involving them.
  

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