Parton Production Scenarios B + G

Initially an ultrarelativistic heavy-ion collision is gluon dominated to a degree that these bosons can be described as a classical vector potential A. The question is now, whether the production of quark-antiquark pairs or the production of quantum gluons from the eld dominates. In the background eld method of quantum chromodynamics a classical gauge eld and quantum uctuations are treated at the same time [1]. We choose a perturbative approach (see succeeding Figs) as analytical non-perturbative results exist only for very few special choices of the form of the eld.