Two Center Light Cone Calculation of Pair Production Induced by   Ultrarelativistic Heavy Ions
  An exact solution of the two center time-dependent Dirac equation for pair production induced by ultrarelativistic heavy ion collisions is presented. Cross sections to specific final states approach those of perturbation theory. Multiplicity rates are reduced from perturbation theory. 
Anthony J. Baltz (BNL) and Larry McLerran (U. of Minn.)