近日，美国德州农工大学Biaogang Wu团队研究了强耦合夸克-胶子等离子体中的非微扰夸克解离率。相关论文于2025年7月15日发表在《高能物理杂志》上。

重夸克和夸克子是超相对论重离子碰撞（URHICs）中产生的热QCD介质输运性质的多功能探针。对重味输运系数的精确描述需要一种微观的方法，在相同的基础上对待开放和隐藏的重味部门。

研究组采用量子多体T矩阵形式计算了夸克-胶子等离子体（QGP）中重夸子的解离速率。该方法的基本成分是重-轻T矩阵，该矩阵利用晶格-QCD数据约束的非微扰驱动核。它在阶梯序列中的恢复与先前主题的准粒子部分的微扰耦合相比，提供了更强的相互作用强度。

介质中夸克的性质，特别是它们与温度相关的结合能，是通过具有相同相互作用核的自一致计算获得的，包括干涉效应（也称为重夸克势的虚部）以及离壳部分谱函数。研究组系统地研究了这些效应的相互作用，并详细阐述了它们与有效场论主题中的偶极子近似的联系。

附：英文原文

Title: Non-perturbative quarkonium dissociation rates in strongly coupled quark-gluon plasma

Author: Wu, Biaogang, Tang, Zhanduo, Rapp, Ralf

Issue&Volume: 2025-07-15

Abstract: Heavy quarks and quarkonia are versatile probes of the transport properties of the hot QCD medium produced in ultra-relativistic heavy-ion collisions (URHICs). A robust description of heavy-flavor transport coefficients requires a microscopic approach that treats the open and hidden heavy-flavor sectors on the same footing. Here, we employ the quantum many-body T -matrix formalism to evaluate the dissociation rates of heavy quarkonia in the quark-gluon plasma (QGP). The basic ingredient is the heavy-light T -matrix, which utilizes a nonperturbative driving kernel constrained by lattice-QCD data. Its resummation in a ladder series provides a much enhanced interaction strength compared to a previously used perturbative coupling to the quasiparticle partons in the QGP. The in-medium quarkonium properties, particularly their temperature-dependent binding energies, are obtained from selfconsistent calculations with the same interaction kernel, including interference effects (also referred to as the imaginary part of the heavy-quark potential) as well as off-shell parton spectral functions. We systematically investigate the interplay of these effects and elaborate on the connections to the dipole approximation used in effective field theory.

DOI: 10.1007/JHEP07(2025)162

Source: https://link.springer.com/article/10.1007/JHEP07(2025)162