用不透明度展开方法研究射流与集体流的从头算耦合
Ab Initio Coupling of Jets to Collective Flow in the Opacity Expansion Approach
摘要：
我们计算的领先修正射流动量加宽和介质引起的分支所产生的速度在一阶不透明的移动介质。这些结果推进了我们对喷流淬灭的认识，并展示了它如何与重离子碰撞中夸克-胶子等离子体的集体流耦合，以及如何与电子-离子对撞机中深度非弹性散射中冷核物质中部分子的轨道运动耦合。我们还计算了由于温度和密度的横向梯度导致的射流动量加宽的主要修正。我们发现，这些影响导致各向异性横向动量扩散成正比的介质速度和各向异性介质感应辐射优先发射的方向上的流动。我们隔离相关的亚程函修正工作与射流组成的标量粒子与介质相互作用的任意颜色因子的标量QCD。适当的颜色因子和光波前波函数的替代，使我们能够立即应用的结果，包括$q \rightarrow q g$分支在真正的QCD的过程范围。由此产生的一般表达式可以直接耦合到流体动力学模拟上的事件，事件的基础上，研究喷流淬火和各种形式的核物质的动力学之间的相关性。
英文摘要：
We calculate the leading corrections to jet momentum broadening and medium-induced branching that arise from the velocity of the moving medium at first order in opacity. These results advance our knowledge of jet quenching and demonstrate how it couples to collective flow of the quark-gluon plasma in heavy-ion collisions and to the orbital motion of partons in cold nuclear matter in deep inelastic scattering at the electron-ion collider. We also compute the leading corrections to jet momentum broadening due to transverse gradients of temperature and density. We find that these effects lead to both anisotropic transverse momentum diffusion proportional to the medium velocity and anisotropic medium-induced radiation emitted preferentially in the direction of the flow. We isolate the relevant sub-eikonal corrections by working with jets composed of scalar particles with arbitrary color factors interacting with the medium by scalar QCD. Appropriate substitution of the color factors and light-front wave functions allow us to immediately apply the results to a range of processes including $q \rightarrow q g$ branching in real QCD. The resulting general expressions can be directly coupled to hydrodynamic simulations on an event-by-event basis to study the correlations between jet quenching and the dynamics of various forms of nuclear matter.
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