Heavy quark diffusion with relativistic Langevin dynamics in the quark-gluon fluid
Heavy quark diffusion with relativistic Langevin dynamics in the quark-gluon fluid
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DOI：
10.1103/physrevc.79.054907
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发表时间：
2008-09
影响因子：
3.1
通讯作者：
Y. Akamatsu;T. Hatsuda;Tetsufumi Hirano
中科院分区：
文献类型：
--
作者：
Y. Akamatsu;T. Hatsuda;Tetsufumi Hirano
基于Ito离散格式下的相对论性Langevin方程，给出了重夸克的相对论性扩散过程。根据反德西特空间/共形场论（AdS/CFT）对应得到的强耦合等离子体的公式，对夸克胶子等离子体（QGP）内部的拖曳力进行了参数化.在相对论流体力学描述的背景物质下，结合Langevin模拟，描述了QGP中粲夸克和底夸克的扩散动力学。对粲衰变和底衰变的单电子核修正因子R{sub AA}和椭圆流v{sub 2}的理论计算与相对论重离子碰撞的实验数据进行了比较。具有大横动量（p{sub T}>3 GeV）的电子的R{sub AA}表明来自QGP的拖曳力与AdS/CFT预测的一样强。
The relativistic diffusion process of heavy quarks is formulated on the basis of the relativistic Langevin equation in Ito discretization scheme. The drag force inside the quark-gluon plasma (QGP) is parametrized according to the formula for the strongly coupled plasma obtained by the anti-de-Sitter space/conformal field theory (AdS/CFT) correspondence. The diffusion dynamics of charm and bottom quarks in QGP is described by combining the Langevin simulation under the background matter described by the relativistic hydrodynamics. Theoretical calculations of the nuclear modification factor R{sub AA} and the elliptic flow v{sub 2} for the single electrons from the charm and bottom decays are compared with the experimental data from the relativistic heavy-ion collisions. The R{sub AA} for electrons with large transverse momentum (p{sub T}>3 GeV) indicates that the drag force from the QGP is as strong as the AdS/CFT prediction.