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The original default mini-jet scale p_0=2 GeV/c and energy loss, dE/dx=2GeV/fm in HIJING lead to a too rapid growth of the multiplicity with energy.RQMD model without mini-jet leads on the other hand to a too slowly increasingmultiplicity with energy. We show that a slight increase of p_0 from thedefault 2.0 GeV/c at sqrt(s)=130A GeV to 2.2 GeV/c at sqrt{s}=200A GeV issufficient to account for the bulk observables. Jet quenching of pi^0 abovep_T>4 GeV/c at 200A GeV is found to be well reproduced in central Au+Au by theoriginal HIJING default prediction. However, the effective surface emission inthe HIJING model formulation of energy loss over-predicts the quenching in moreperipheral collisions. Neither HIJING nor HIJING/B{bar}B can account for theobserved anomalous excess of moderate p_T<4 GeV/c baryons. The agreement ofRQMD with data in this p_T region is shown to be fortuitous because, withoutmini-jets, it fails to reproduce the p+p spectrum.Comment: 36 pages,Latex(revtex), 13 figures, submitted to Phys. Rev.

Minijet scale and energy loss at relativistic energies in event generator models