Multipartonic cascades in expanding media

Multi-partonic medium induced cascades in expanding media

Going beyond the simplified gluonic cascades, we introduce both gluon and quark degrees of freedom for partonic cascades inside the medium. We then solve the set of coupled evolution equations numerically with splitting kernels calculated for static, exponential, and Bjorken expanding media to arrive at medium-modified parton spectra for quark and gluon initiated jets. Using these, we calculate the inclusive jet $R_{AA}$ where the phenomenologically driven combinations of quark and gluon jet fractions are included. Then, the rapidity dependence of the jet $R_{AA}$ is examined. We also study th…

Jet quenching and scaling properties of medium-evolved gluon cascade in expanding media

We present a study of the impact of the expansion of deconfined medium on single-gluon emission spectra and the jet suppression factor ($Q_{AA}$) within the BDMPS-Z formalism. These quantities are calculated for three types of media (static medium, exponentially decaying medium and Bjorken expanding medium). The distribution of medium-induced gluons and the jet $Q_{AA}$ are calculated using the evaluation of in-medium evolution with splitting kernels derived from the gluon emission spectra. Scaling behavior of splitting kernels is derived for low-x and high-x regimes in the asymptote of large …

介质诱导级联在膨胀介质中的横向动量展宽

Transverse momentum broadening of medium-induced cascades in expanding media

本研究通过数值求解BDIM方程，发现低-x区域胶子级联展宽在不同膨胀介质中相似，主要由多次分裂主导，并阐明锥外能量损失机制及其对喷注淬灭的影响。

Medium-induced cascade in expanding media

Detailed insight into the interplay between parton energy loss and the way deconfined medium created in heavy-ion collisions expands is of great importance for improving the understanding of the jet quenching phenomenon. In this paper we study the impact of the expansion of deconfined medium on the single-gluon emission spectrum, its resummation and the jet suppression factor ($Q_{AA}$) within the BDMPS-Z formalism. We calculate these quantities for three types of expansion scenarios, namely static, exponentially decaying and Bjorken expanding media. The distribution of medium-induced gluons i…

膨胀夸克-胶子等离子体的化学平衡

Chemical Equilibration of an Expanding Quark-Gluon Plasma

本文研究了在CERN大型强子对撞机上两重核碰撞中部分子分布的化学平衡。初始条件是从一个自屏蔽部分子级联计算。横向膨胀的系统的发病被发现阻碍化学平衡。系统最初接近化学平衡，但当横向速度变大时，系统被驱离化学平衡。

纵向扩展标量理论中的非平衡不动点：红外级联、玻色凝聚和对动力学理论的挑战

Nonequilibrium fixed points in longitudinally expanding scalar theories: infrared cascade, Bose condensation and a challenge for kinetic theory

In Phys. Rev. Lett. 114（2015）6，061601，我们报道了纵向扩展系统的新普适类，包括强相关的非阿贝尔等离子体和$N$分量自相互作用标量场理论。使用经典统计方法，我们发现，这些系统共享相同的自相似标度特性的范围很广的动量在一个限制，粒子弱耦合，但他们的占有率高。在这里，我们显着扩展了之前的工作，并进一步描述了两个自相似机制。其中之一发生在极高占位率的深红外（IR）区域，其中非平衡动力学导致形成玻色-爱因斯坦凝聚体。通用的IR标度指数和光谱指数表征的各向同性IR分布的一个有效的理论来自一个系统的大$N$展开在次到领先的顺序。值得注意的是，这个有效的理论可以被看作是一个顶点标记的动力学理论。另一种新的自相似机制出现在理论的硬物理尺度附近，只是在后来才出现。我们认为，红外动力学的重要作用，确保我们的标量和规范理论的结果的关键特征不能在传统的动力学理论框架一致地再现。