The Mini-Jet Scale and Energy Loss at RHIC in the HIJING and RQMD Models
Abstract
The original default mini-jet scale p0=2 GeV/c and energy loss, dE/dx=2 GeV/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 increasing multiplicity with energy. We show that a slight increase of p0 from the default 2.0 GeV/c at sqrt(s)=130A GeV to 2.2 GeV/c at sqrts=200A GeV is sufficient to account for the bulk observables. Jet quenching of pi0 above pT>4 GeV/c at 200A GeV is found to be well reproduced in central Au+Au by the original HIJING default prediction. However, the effective surface emission in the HIJING model formulation of energy loss over-predicts the quenching in more peripheral collisions. Neither HIJING nor HIJING/BbarB can account for the observed anomalous excess of moderate pT<4 GeV/c baryons. The agreement of RQMD with data in this pT region is shown to be fortuitous because, without mini-jets, it fails to reproduce the p+p spectrum.
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