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arXiv 0810.1314hep-ph
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非阿贝尔等离子体中的横向动量扩散和喷流能量损失

Transverse momentum diffusion and jet energy loss in non-Abelian plasmas

Bjoern Schenke, Michael Strickland, Adrian Dumitru, Yasushi Nara, Carsten Greiner

摘要:

我们考虑了热非阿贝尔等离子体中高动量部分子由于碰撞而产生的动量展宽和能量损失。我们实时求解了晶格上的Wong-Yang-Mills方程组,包括部分子间的二元硬弹性碰撞。碰撞核的构造使得总的碰撞能量损失和动量展宽是晶格间距无关的。我们发现,输运系数$\hat{q}$对应的横向动量加宽收到相当大的贡献,从幂律尾的$p_\perp$分布的高动量部分子。我们建立了$\hat{q}$和$dE/dx$的密度,温度和能量的弱耦合制度的标度。我们还估计了由于经典杨米尔斯场中喷流的弹性能量损失而引起的核修饰因子$R_{AA}$。

英文摘要:

We consider momentum broadening and energy loss of high momentum partons in a hot non-Abelian plasma due to collisions. We solve the coupled system of Wong-Yang-Mills equations on a lattice in real time, including binary hard elastic collisions among the partons. The collision kernel is constructed such that the total collisional energy loss and momentum broadening are lattice spacing independent. We find that the transport coefficient $\hat{q}$ corresponding to transverse momentum broadening receives sizable contributions from a power-law tail in the $p_\perp$-distribution of high-momentum partons. We establish the scaling of $\hat{q}$ and of $dE/dx$ with density, temperature and energy in the weak-coupling regime. We also estimate the nuclear modification factor $R_{AA}$ due to elastic energy loss of a jet in a classical Yang-Mills field.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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