Momentum transport away from a jet in an expanding nuclear medium
Momentum transport away from a jet in an expanding nuclear medium
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DOI：
10.1103/physrevc.90.021902
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发表时间：
2014-02
影响因子：
3.1
通讯作者：
Y. Tachibana;Tetsufumi Hirano
中科院分区：
文献类型：
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作者：
Y. Tachibana;Tetsufumi Hirano
本文研究了超相对论重离子碰撞中喷流动量的输运动力学。假设高能部分子穿越膨胀的夸克胶子流体并损失能量和动量，在全（3+1）维坐标系下通过数值求解相对论流体动力学方程组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。结果表明，在与射流轴线成较大角度时，低p_{T}$粒子的产率增加，并补偿了射流锥内的双射流动量不平衡。这提供了一个新的解释双射流不对称事件所观察到的CMS协作。
We study the transport dynamics of momenta deposited from jets in ultra-relativistic heavy-ion collisions. Assuming that the high energy partons traverse expanding quark-gluon fluids and are subject to lose their energy and momentum, we simulate di-jet asymmetric events by solving relativistic hydrodynamic equations numerically without linearization in the fully (3+1)-dimensional coordinate. Mach cones are formed and strongly broadened by radial flow of the background medium. As a result, the yield of low-$p_{T}$ particles increases at large angles from the jet axis and compensates the di-jet momentum imbalance inside the jet-cone. This provides a novel interpretation of di-jet asymmetric events observed by the CMS Collaboration.