In this article, there are 18 sections discussing various current topics in the field of relativistic heavy-ion collisions and related phenomena, which will serve as a snapshot of the current state of the art. Section 1 reviews experimental results of some recent light-flavored particle production data from ALICE collaboration. Other sections are mostly theoretical in nature. Very strong but transient magnetic field created in relativistic heavy-ion collisions could have important observational consequences. This has generated a lot of theoretical activity in the last decade. Sections 2, 7, 9, 10 and 11 deal with the effects of the magnetic field on the properties of the QCD matter. More specifically, Sec. 2 discusses mass of π0 in the linear sigma model coupled to quarks at zero temperature. In Sec. 7, one-loop calculation of the anisotropic pressure are discussed in the presence of strong magnetic field. In Sec. 9, chiral transition and chiral susceptibility in the NJL model is discussed for a chirally imbalanced plasma in the presence of magnetic field using a Wigner function approach. Sections 10 discusses electrical conductivity and Hall conductivity of hot and dense hadron gas within Boltzmann approach and Sec. 11 deals with electrical resistivity of quark matter in presence of magnetic field. There are several unanswered questions about the QCD phase diagram. Sections 3, 11 and 18 discuss various aspects of the QCD phase diagram and phase transitions. Recent years have witnessed interesting developments in foundational aspects of hydrodynamics and their application to heavy-ion collisions. Sections 12 and 15–17 of this article probe some aspects of this exciting field. In Sec. 12, analytical solutions of viscous Landau hydrodynamics in 1+1D are discussed. Section 15 deals with derivation of hydrodynamics from effective covariant kinetic theory. Sections 16 and 17 discuss hydrodynamics with spin and analytical hydrodynamic attractors, respectively. Transport coefficients together with their temperature- and density-dependence are essential inputs in hydrodynamical calculations. Sections 5, 8 and 14 deal with calculation/estimation of various transport coefficients (shear and bulk viscosity, thermal conductivity, relaxation times, etc.) of quark matter and hadronic matter. Sections 4, 6 and 13 deal with interesting new developments in the field. Section 4 discusses color dipole gluon distribution function at small transverse momentum in the form of a series of Bells polynomials. Section 6 discusses the properties of Higgs boson in the quark–gluon plasma using Higgs–quark interaction and calculate the Higgs decays into quark and anti-quark, which shows a dominant on-shell contribution in the bottom-quark channel. Section 13 discusses modification of coalescence model to incorporate viscous corrections and application of this model to study hadron production from a dissipative quark–gluon plasma.

中文翻译：

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QCD物质动力学——现状

在这篇文章中，有 18 个部分讨论了相对论重离子碰撞和相关现象领域的各种当前主题，这将作为当前技术状态的快照。第 1 节回顾了最近来自 ALICE 合作的一些淡味颗粒生产数据的实验结果。其他部分主要是理论上的。在相对论重离子碰撞中产生的非常强但瞬态的磁场可能会产生重要的观测结果。这在过去十年中产生了许多理论活动。第 2、7、9、10 和 11 节讨论磁场对 QCD 物质性质的影响。更具体地说，秒。2 讨论质量π0在与零温度下的夸克耦合的线性 sigma 模型中。在秒。在图7中，讨论了强磁场存在下各向异性压力的单循环计算。在秒。在图 9 中，使用 Wigner 函数方法讨论了在存在磁场的情况下手性不平衡等离子体的 NJL 模型中的手性转变和手性敏感性。第 10 节讨论了玻尔兹曼方法和第 2 节中热的和致密的强子气体的电导率和霍尔电导率。图 11 处理在磁场存在下夸克物质的电阻率。关于 QCD 相图有几个悬而未决的问题。第 3、11 和 18 节讨论 QCD 相图和相变的各个方面。近年来，在流体动力学的基础方面及其在重离子碰撞中的应用方面取得了有趣的进展。本文的第 12 节和第 15-17 节探讨了这一激动人心的领域的某些方面。在秒。参见图12，讨论了1+1D中粘性Landau流体动力学的解析解。第 15 节处理从有效协变动力学理论推导流体动力学。第 16 节和第 17 节分别讨论了具有自旋和解析流体力学吸引子的流体动力学。输运系数及其温度和密度相关性是流体动力学计算的基本输入。第 5、8 和 14 节处理夸克物质和强子物质的各种输运系数（剪切和体积粘度、热导率、弛豫时间等）的计算/估计。第 4 节，第 6 节和第 13 节讨论了该领域有趣的新发展。第 4 节以一系列 Bells 多项式的形式讨论了小横向动量下的彩色偶极胶子分布函数。第 6 节使用希格斯-夸克相互作用讨论了夸克-胶子等离子体中希格斯玻色子的性质，并计算了希格斯衰变为夸克和反夸克，这表明在底夸克通道中占主导地位的壳上贡献。第 13 节讨论了合并模型的修改以结合粘性校正以及该模型在研究耗散夸克 - 胶子等离子体中产生强子的应用。第 6 节使用希格斯-夸克相互作用讨论了夸克-胶子等离子体中希格斯玻色子的性质，并计算了希格斯衰变为夸克和反夸克，这表明在底夸克通道中占主导地位的壳上贡献。第 13 节讨论了合并模型的修改以结合粘性校正以及该模型在研究耗散夸克 - 胶子等离子体中产生强子的应用。第 6 节使用希格斯-夸克相互作用讨论了夸克-胶子等离子体中希格斯玻色子的性质，并计算了希格斯衰变为夸克和反夸克，这表明在底夸克通道中占主导地位的壳上贡献。第 13 节讨论了合并模型的修改以结合粘性校正以及该模型在研究耗散夸克 - 胶子等离子体中产生强子的应用。