A scheme for fast exploratory simulation of azimuthal asymmetries in   Drell-Yan experiments at intermediate energies. The DY_AB Monte Carlo event   generator
  In this note I report and discuss the physical scheme and the main approximations used by the event generator code DY\_AB. This Monte Carlo code is aimed at preliminary simulation, during the stage of apparatus planning, of Drell-Yan events characterized by azimuthal asymmetries, in experiments with moderate center of mass energy $\sqrt{s}$ $<<$ 100 GeV. 
Andrea Bianconi