论文标题
Quark-Gluon等离子体中的底元光谱法
Bottomonium spectroscopy in the quark-gluon plasma
论文作者
论文摘要
与在同一质量中心能量中可以在PP碰撞中测试的真空状况相比，在相对论重的重离子碰撞中产生的Quark-Gluon血浆（QGP）中，重夸克尼亚的光谱特性大不相同。在本文中，总结了有关热QGP中Y（NS）和CHI_B（NP）状态的一系列有关解离的作品。夸克尼亚解离是由于（1）筛选了实际夸克式电位的电势，（2）碰撞阻尼穿过电势的假想部分，以及（3）Gluon诱导的解离。此外，减少的进料对自旋三个基态起着决定性的作用。 LHC能量的PB-PB碰撞中，横向摩托和中心性依赖性数据很好地再现。在不对称的P-PB系统中，铅核中的Parton密度的变化占冷核物质修饰（CNM）的主要部分，但是热中等效应却与火球的初始空间范围相关，这是Quark-Gluon掉落型掉落的其他初始空间范围。
The spectroscopic properties of heavy quarkonia are substantially different in the quark-gluon plasma (QGP) that is created in relativistic heavy-ion collisions as compared to the vacuum situation that can be tested in pp collisions at the same center-of-mass energy. In this article, a series of recent works about the dissociation of the Y(nS) and chi_b(nP) states in the hot QGP is summarized. Quarkonia dissociation occurs due to (1) screening of the real quark-antiquark potential, (2) collisional damping through the imaginary part of the potential, and (3) gluon-induced dissociation. In addition, reduced feed-down plays a decisive role for the spin-triplet ground state. Transverse-momentum and centrality-dependent data are well reproduced in Pb-Pb collisions at LHC energies. In the asymmetric p-Pb system, alterations of the parton density functions in the lead nucleus account for the leading fraction of the modifications in cold nuclear matter (CNM), but the hot-medium effects turn out to be relevant in spite of the small initial spatial extent of the fireball, providing additional evidence for the generation of a quark-gluon droplet.
