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The BaBar physics list contains the processes required to simulate B-physics events in the BaBar detector. The initial high-energy event is provided by a set of event generators chosen by the user. The simulation includes Bhabha scattering, dimuons, and the particles arising from B-decay. As a result the physics list processes and models have been chosen for an energy range of 9 GeV and below. The BaBar physics list is already quite mature and has been used since 2001 for the production of billions of simulated events.
A more detailed description of the BaBar physics list is available.