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arXiv 1010.1635hep-phnucl-th
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不同流体动力学模型中射流淬火的系统比较

A systematic comparison of jet quenching in different fluid-dynamical models

Thorsten Renk, Hannu Holopainen, Ulrich Heinz, Chun Shen

备注：
17 pages, 11 figures
发表信息：
Phys.Rev.C83:014910,2011
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摘要：

比较了四种不同的（理想的和粘性的）流体动力学模型对200 AGeV Au-Au碰撞产生的介质演化的影响，结合两种不同的部分子能量损失与路径长度关系的模型，研究了喷注猝灭对核抑制因子R_AA（phi）和离侧每次触发产额I_AA（phi）与发射角关系的影响.每个流体动力学模型进行了调整，以提供一个合理的描述的单粒子横向动量谱的所有碰撞中心，和能量损失模型进行了调整，以产生相同的π核抑制因子在中央Au-Au碰撞。我们发现，将部分子能量损失的权重沿其路径移到后面的模型能更好地再现实验测得的面内和面外扩展R_AA（phi），在本文所研究的模型中，抑制早期能量损失的能量损失模型能最好地实现这一点，与流体动力学模型相结合，该流体动力学模型延迟由于粘性加热引起的流体动力学膨胀而导致的介质密度的稀释。我们无法确定I_AA（phi）测量相对于R_AA（phi）测量的明确的断层成像益处。

英文摘要：

Comparing four different (ideal and viscous) hydrodynamic models for the evolution of the medium created in 200 AGeV Au-Au collisions, combined with two different models for the path length dependence of parton energy loss, we study the effects of jet quenching on the emission-angle dependence of the nuclear suppression factor R_AA(phi) and the away-side per trigger yield I_AA(phi). Each hydrodynamic model was tuned to provide a reasonable description of the single-particle transverse momentum spectra for all collision centralities, and the energy loss models were adjusted to yield the same pion nuclear suppression factor in central Au-Au collisions. We find that the experimentally measured in-plane vs. out-of-plane spread in R_AA(phi) is better reproduced by models that shift the weight of the parton energy loss to later times along its path. Among the models studied here, this is best achieved by energy loss models that suppress energy loss at early times, combined with hydrodynamic models that delay the dilution of the medium density due to hydrodynamic expansion by viscous heating. We were unable to identify a clear tomographic benefit of a measurement of I_AA(phi) over that of R_AA(phi).

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