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arXiv 1402.6469nucl-thhep-phnucl-ex
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膨胀核介质中喷流的动量输运

Momentum transport away from a jet in an expanding nuclear medium

Yasuki Tachibana, Tetsufumi Hirano

备注：
5 pages, 2 figures; v2: published version in Phys. Rev. C
发表信息：
Phys. Rev. C 90, 021902 (2014)
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摘要：

研究了超相对论重离子碰撞中喷流沉积动量的输运动力学。假设高能部分子穿过膨胀的夸克胶子流体并损失能量和动量，在全（3+1）维坐标下，通过数值求解相对论流体动力学方程，模拟了双喷流非对称事件.马赫锥的形成和强烈的背景介质的径向流动扩大。结果，低$p_{T}$颗粒的产率在与射流轴线成大角度时增加，并补偿了射流锥内的双射流动量不平衡。这提供了一个密切的联系介质之间的激励射流和结果在双射流不对称事件所观察到的CMS合作。

英文摘要：

We study the transport dynamics of momenta deposited from jets in ultrarelativistic heavy-ion collisions. Assuming that the high-energy partons traverse expanding quark-gluon fluids and are subject to lose their energy and momentum, we simulate dijet asymmetric events by solving relativistic hydrodynamic equations numerically without linearization in the fully (3+1)-dimensional coordinate. Mach cones are formed and strongly broadened by radial flow of the background medium. As a result, the yield of low-$p_{T}$ particles increases at large angles from the jet axis and compensates the dijet momentum imbalance inside the jet-cone. This provides an intimate link between the medium excitation by jets and results in dijet asymmetric events observed by the CMS Collaboration.

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