论文标题
在强耦合夸克 - 胶状等离子体中的非平衡炭再生
Non-equilibrium charmonium regeneration in strongly coupled quark-gluon plasma
论文作者
论文摘要
对超旧式重型离子碰撞（URHIC）中Quarkonium再生的评估需要了解扩展的Quark-Gluon等离子体（QGP）火球中的重夸克相空间分布。我们采用了一种半古典的炭运输方法，通过Langevin模拟其扩散，再生过程明确解释了魅力夸克的时间依赖性光谱。通过相同的魅力 - 中等相互作用计算非弹性炭速率和魅力夸克传输系数。后者以扰动率进行建模，并用$ k $ factor增强，以表示非扰动的相互作用强度和干扰效果。使用Central 5.02〜TEV PB-PB碰撞作为测试案例，我们发现，如果使用较大的$ k \ gtrsim5 $，则可以实现对测得的$ j/ψ$产量及其横向依赖性的良好描述，而较小的值则导致明显的差异。这与URHICS中的开放式现象学一致，其中需要相似强度的非扰动相互作用。我们的方法建立了一个通用的传输框架，用于对开放式和隐藏重味（HF）可观察物的显微镜描述，该框架同时融合了非扰动和非平衡效应，从而增强了从实验中提取QGP传输特性的相互约束。
The evaluation of quarkonium regeneration in ultrarelativistic heavy-ion collisions (URHICs) requires the knowledge of the heavy-quark phase space distributions in the expanding quark-gluon plasma (QGP) fireball. We employ a semi-classical charmonium transport approach where regeneration processes explicitly account for the time-dependent spectra of charm quarks via Langevin simulations of their diffusion. The inelastic charmonium rates and charm-quark transport coefficients are computed from the same charm-medium interaction. The latter is modeled by perturbative rates, augmented with a $K$-factor to represent nonperturbative interaction strength and interference effect. Using central 5.02~TeV Pb-Pb collisions as a test case we find that a good description of the measured $J/ψ$ yield and its transverse-momentum dependence can be achieved if a large $K\gtrsim5$ is employed while smaller values lead to marked discrepancies. This is in line with open-charm phenomenology in URHICs, where nonperturbative interactions of similar strength are required. Our approach establishes a common transport framework for a microscopic description of open and hidden heavy-flavor (HF) observables that incorporates both nonperturbative and non-equilibrium effects, and thus enhances the mutual constraints from experiment on the extraction of transport properties of the QGP.
