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arXiv 2111.07563hep-phnucl-th
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各向异性QCD介质中重夸克的静态拖曳

Dragging heavy quark in an anisotropic QCD medium beyond the static limit

Avdhesh Kumar, Manu Kurian, Santosh K. Das, Vinod Chandra

备注：
9 pages, 4 figures
发表信息：
Phys. Rev. C 105 (2022) 5, 054903
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摘要：

采用福克-普朗克方法分析了各向异性QCD介质中的重夸克动力学。利用各向异性介质的一般张量基，将重夸克曳力和动量扩散张量分解。根据介质动量各向异性方向和重夸克运动方向的相对取向，在各向异性QCD介质中估计了两个拖曳系数和四个扩散系数。阻力和动量扩散系数的不同组成部分的相对意义进行了探讨。研究了各向异性矢量与重夸克运动的夹角对阻力系数和扩散系数的依赖关系。进一步研究了各向异性介质中重夸克弹性碰撞过程的能量损失。结果表明，各向异性对重夸克输运系数及其碰撞能量损失的贡献与QCD介质中动量各向异性的方向和强度有很强的依赖性。

英文摘要：

Heavy quark dynamics in an anisotropic QCD medium have been analyzed within the Fokker-Planck approach. Heavy quark drag force and momentum diffusion tensor have been decomposed by employing a general tensor basis for an anisotropic medium. Depending upon the relative orientation of the direction of the momentum anisotropy of the medium and heavy quark motion, two drag and four diffusion coefficients have been estimated in the anisotropic QCD medium. The relative significance of different components of drag and momentum diffusion coefficients has been explored. The dependence of the angle between the anisotropic vector and heavy quark motion to the drag and diffusion coefficients has also been studied. Further, the energy loss of heavy quarks due to the elastic collisional process in an anisotropic medium has been studied. It is seen that the anisotropic contributions to heavy quark transport coefficients and its collisional energy loss have a strong dependence on the direction and strength of momentum anisotropy in the QCD medium.

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