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arXiv 2111.03400hep-phhep-latnucl-th
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玻璃体实时晶格模拟中的横向动量展宽

Transverse momentum broadening in real-time lattice simulations of the glasma

Andreas Ipp, David I. Müller, Daniel Schuh

摘要:

对重离子碰撞中喷流的研究提供了关于部分子与它们穿过的介质相互作用的重要信息。喷流的种子是高能部分子,它们是碰撞过程中硬散射产生的。因此,它们受到介质时间演化的所有不同阶段的影响,包括作为夸克-胶子等离子体的预平衡前体状态的玻璃体。在这里,我们报告我们的数值晶格模拟的部分子穿越的助推不变,非微扰的玻璃在RHIC和LHC碰撞的早期阶段创建。我们发现在玻璃化阶段,部分子迅速积累横动量,达到饱和动量。此外,我们观察到一个有趣的各向异性的横向动量展宽的部分子与更大的展宽在快度比在方位角方向。其成因可能与玻璃初始状态下纵向色电和色磁通量管之间的相关性有关。我们将这些观测结果与弱场近似下的半解析结果进行了比较,在弱场近似下,我们也发现了部分子横向动量展宽的各向异性。

英文摘要:

The study of jets in heavy-ion collisions provides important information about the interaction of partons with the medium that they traverse. The seeds of jets are highly energetic partons, which are produced from hard scatterings during the collision event. As such, they are affected by all different stages of the medium's time evolution, including the glasma, which is the pre-equilibrium precursor state of the quark-gluon plasma. Here we report on our numerical lattice simulations of partons traversing the boost-invariant, non-perturbative glasma as created at the early stages of collisions at RHIC and LHC. We find that partons quickly accumulate transverse momentum up to the saturation momentum during the glasma stage. Furthermore, we observe an interesting anisotropy in transverse momentum broadening of partons with larger broadening in the rapidity than in the azimuthal direction. Its origin can be related to correlations among the longitudinal color-electric and color-magnetic flux tubes in the initial state of the glasma. We compare these observations to the semi-analytic results obtained by a weak-field approximation, where we also find such an anisotropy in a parton's transverse momentum broadening.

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