Empirical Constraints on Parton Energy Loss in Nucleus-Nucleus Collisions at RHIC

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dc.creatorWang, Gang
dc.creatorHuang, Huan Zhong
dc.date2008-10-15
dc.date2008-12-15
dc.date.accessioned2026-07-07T12:36:19Z
dc.date.available2026-07-07T12:36:19Z
dc.descriptionWe present empirical features of parton energy loss in nucleus-nucleus collisions at RHIC through studies of the spectra and nuclear modification factors ($R_{AA}$) for charged hadrons, neutral pions ($π^0$) and non-photonic electrons. The flat distribution of $R_{AA}$ at high transverse momentum ($p_{T}$) for a given collision centrality is consistent with a scenario where parton energy loss $Δp_{T}$ is proportional to $p_{T}$. The centrality dependence of the parton energy loss indicates the absence of path length dependence in the magnitude of energy loss. The lack of strong path length dependence suggests a dynamical picture where the dense partonic medium undergoes rapid expansion and the density of the medium falls rapidly in the first a few Fermi interval, which may be much shorter than the full path length. Implications of the empirical constraints on the parton energy loss will also be discussed.
dc.description6 pages, 5 figures, submitted to Phys. Lett. B
dc.identifierhttps://arxiv.org/abs/0810.2822
dc.identifierhttp://arxiv.org/abs/0810.2822
dc.identifierPhys.Lett.B672:30-34,2009
dc.identifierdoi:10.1016/j.physletb.2009.01.005
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/218054
dc.subjectNuclear Experiment
dc.titleEmpirical Constraints on Parton Energy Loss in Nucleus-Nucleus Collisions at RHIC
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