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19 April 2024 |
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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
; | | Date: |
26 Sep 2002 | | Journal: | Phys.Rev. C68 (2003) 054902 | | Subject: | nucl-th | | Affiliation: | McGill Univ., Canada), M. Gyulassy (Columbia Univ.NY, USA), J. Barrette, C. Gale (McGill Univ., Canada), X.N. Wang, N. Xu, K. Filimonov (LBNL, Berkeley, USA | | Abstract: | The original default mini-jet scale p_0=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 p_0 from the default 2.0 GeV/c at sqrt(s)=130A GeV to 2.2 GeV/c at sqrt{s}=200A GeV is sufficient to account for the bulk observables. Jet quenching of pi^0 above p_T>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/B{bar}B can account for the observed anomalous excess of moderate p_T<4 GeV/c baryons. The agreement of RQMD with data in this p_T region is shown to be fortuitous because, without mini-jets, it fails to reproduce the p+p spectrum. | | Source: | arXiv, nucl-th/0209089 | | Services: | Forum | Review | PDF | Favorites | |
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