arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2301.09110hep-ph
收藏

夸克-反夸克相互作用与重夸克动力学对磁场的响应

Responses of quark-antiquark interaction and heavy quark dynamics to magnetic field

He-Xia Zhang, Enke Wang

备注：
24 pages, 15 figures; Version published in Phys. Rev. D
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

AI总结：

本文采用硬热圈重求和与量纲二胶子凝聚，在超越最低朗道能级近似下研究磁场中QGP的重夸克势和动量扩散，揭示其各向异性及非微扰作用的重要性。

摘要：

我们研究了由碰撞原子核产生的磁场对夸克-胶子等离子体（QGP）中重夸克-反夸克相互作用以及重夸克动力学的影响。借助硬热圈重求和技术并结合量纲为二的胶子凝聚，我们在超越最低朗道能级近似的条件下，计算了静态重夸克势和重夸克动量扩散系数，二者同时纳入了重夸克与QGP介质之间的微扰与非微扰相互作用。我们发现，磁场中重夸克势的虚部表现出显著的各向异性。具体而言，与夸克-反夸克间距沿平行于磁场方向排列相比，当该间距沿垂直于磁场方向排列时，虚部的绝对值更大。磁化QGP介质中的重夸克动量扩散系数也变得具有各向异性。随着温度升高，更高朗道能级的影响变得日益显著，导致重夸克动量扩散系数的各向异性比值下降，甚至低于1。在足够高的温度下，该比值最终趋近于1。非微扰相互作用对于理解低温区域的重夸克动力学不可或缺。我们还研究了黏性夸克物质对磁场的响应，并探讨了其对重夸克势、夸克偶素态的热衰变宽度以及重夸克动量扩散系数的意义。

英文摘要：

We investigate the impact of the magnetic field generated by colliding nuclei on heavy quark-antiquark interactions and heavy quark dynamics in the quark-gluon plasma (QGP). By means of hard-thermal-loop resummation technique combined with dimension-two gluon condensates, the static heavy quark potential and heavy quark momentum diffusion coefficient, which incorporate both perturbative and non-perturbative interactions between heavy quarks and the QGP medium, are computed beyond the lowest Landau level approximation. We find that the imaginary part of the heavy quark potential in the magnetic field exhibits significant anisotropy. Specifically, the absolute value of the imaginary part is larger when the quark-antiquark separation is aligned perpendicular to the magnetic field direction, compared to when it is aligned parallel to the magnetic field direction. The heavy quark momentum diffusion coefficient in the magnetized QGP medium also becomes anisotropic. As the temperature rises, the influence of higher Landau levels becomes increasingly significant, resulting in a decrease in the anisotropy ratio of the heavy quark momentum diffusion coefficient to values even below 1. At sufficiently high temperatures, this ratio ultimately approaches 1. The non-perturbative interactions are indispensable for understanding heavy quark dynamics in the low-temperature region. We also study the response of viscous quark matter to the magnetic field and explore its implications for heavy quark potential, thermal decay widths of quarkonium states, as well as heavy quark momentum diffusion coefficient.

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。

↑