Pseudorapidity dependence of parton energy loss in relativistic heavy ion collisions

Details Pseudorapidity dependence of parton energy loss in relativistic heavy ion collisions Pseudorapidity dependence of parton energy loss in relativistic heavy ion collisions

2003-07-22

arxiv.org/abs/nucl-th/0307087v3

Phys.Rev. C68 (2003) 064902

Physics

Nuclear Physics

Nuclear Theory

5 pages, 4 figures; one figure added

Scientific paper

10.1103/PhysRevC.68.064902

We analyze the recent data from the BRAHMS Collaboration on the pseudorapidity dependence of nuclear modification factors in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV by using the full three dimensional hydrodynamic simulations for the density effects on parton energy loss. We first compute the transverse spectra at $\eta=0$ and 2.2, and next take a ratio $R_{\eta}=R_{AA}(\eta=2.2)/R_{AA}(\eta=0)$, where $R_{AA}$ is a nuclear modification factor. It is shown that hydrodynamic components account for $R_{\eta}\simeq 1$ at low $p_\mathrm{T}$ and that quenched pQCD components lead $R_{\eta} < 1$ at high $p_\mathrm{T}$ which are consistent with the data. Strong suppression at $\eta=2.2$ is compatible with the parton energy loss in the final state.

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