Event Generators

Event generators and analysis tools for electron-deuteron collisions with spectator nucleon tagging are being developed for process simulations at EIC. The materials are presently organized in the following categories:

  • Collider: Code simulates electron-deuteron collisions with spectator tagging at EIC under realistic conditions, including finite crossing angle and intrinsic momentum fluctuations in the beam. Events are generated in the collider lab frame (colliding beams). Cross section is calculated using e + D → e'+p+X physics model. Output is set up to be passed to full detector simulations (Geant).
  • Fixed-target: Code simulates electron-deuteron collisions with spectator tagging in the nucleus rest frame, which coincdes with the lab frame in fixed-target experiments. Serves as test of collider code in the limit of zero ion beam momentum.
  • On-shell extrapolation: Using a physics model we studied the precision of neutron structure extraction through on-shell extrapolation under different assumptions regarding data quality (random and systematic errors). Also compared model-independent on-shell extrapolation with model-dependent extraction by fitting data to physics models.
  • Toolbox: Various generator tools. (a) Code to generate the electron-ion event in the collider lab frame and boost it to the ion rest frame ("fixed-target frame," developed by Ch. Hyde). Useful for many applications. Code can also perform transformation back to the collider lab frame. (b) Basic utility for Lorentz transform between frames.

 

The codes and simulation results are maintained on github. Scientists interested in using these resources or developing specific applications are requested to contact Doug Higinbotham or Kijun Park.