arXiv 2005.002372020-05-01hep-ph

相对论性重离子碰撞的若干问题

Aspects of relativistic heavy-ion collisions

Georg Wolschin

备注：: 19 pages, 19 figures
发表信息：: Universe 6, 61 (2020)
DOI：: 10.3390/universe6050061

摘要：

本文用非线性扩散方程的解析解和图解的初始条件处理了相对论性重离子碰撞初始阶段夸克和胶子的快速热化，对胶子用奇异性边界条件处理。在同样短的时间尺度$t \le1$ fm/ $c$上，重子的停止是通过基于价夸克和胶子的部分子分布函数的QCD方法来解释的。用线性相对论扩散模型唯象地考虑了带电强子的产生，模型中有两个碎裂源和一个随$\ln^3(s_{NN})$上升的中心胶子源。在相对论重离子对撞机（RHIC）上获得的能量数据与极限碎裂猜想一致，而在$\sqrt{s_{NN}}= 2.76$和$5.02$ TeV的能量下，极限碎裂猜想与大型强子对撞机（LHC）的Pb-Pb数据一致。利用夸克偶素作为硬探针研究了夸克-胶子等离子体（QGP）的性质，并与最近的CMS、ALICE和LHCb实验数据进行了比较.

英文摘要：

The rapid thermalization of quarks and gluons in the initial stages of relativistic heavy-ion collisions is treated using analytic solutions of a nonlinear diffusion equation with schematic initial conditions, and for gluons with boundary conditions at the singularity. On a similarly short time scale of $t \le1$ fm/$c$, the stopping of baryons is accounted for through a QCD-inspired approach based on the parton distribution functions of valence quarks, and gluons. Charged-hadron production is considered phenomenologically using a linear relativistic diffusion model with two fragmentation sources, and a central gluonic source that rises with $\ln^3(s_{NN})$. The limiting-fragmentation conjecture that agrees with data at energies reached at the Relativistic Heavy Ion Collider (RHIC) is found to be consistent with Large Hadron Collider (LHC) data for Pb-Pb at $\sqrt{s_{NN}}= 2.76$ and $5.02$ TeV. Quarkonia are used as hard probes for the properties of the quark-gluon plasma (QGP) through a comparison of theoretical predictions with recent CMS, ALICE and LHCb data for Pb-Pb and p-Pb collisions.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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