PHYSICS OF THE FIRST 0.3 FM C AT RHIC

We have studied multiple gluon production at the first impact of pp an d AA collisions, using large order tree diagrams. We have found that t his gluon production mechanism at RHIC is more important comparing to simpler processes considered before. Predictions depend strongly on pe rturbative cutoff, which we evaluate in a self-consistent way. The est imated entropy production at first impact at RHIC Au+Au collisions is comparable or even larger than usual extrapolations. In the LHC case, earlier estimates are but a first term of divergent series: presumably , non-perturbative theory has to be developed here.