The Mini-Jet Scale and Energy Loss at RHIC in the HIJING and RQMD Models
V. Topor Pop, M. Gyulassy, J. Barrette, C. Gale, X. N. Wang, N. Xu, K. Filimonov
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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