重离子碰撞中整体极化的实验研究
Experimental Studies of Global Polarization in Heavy-ion Collisions
陈金辉1
作者信息
- 1. 复旦大学现代物理研究所&核物理与离子束应用教育部重点实验室,上海 200438
- 折叠
摘要
非对心的相对论重离子碰撞在反应区域产生了巨大的轨道角动量,该轨道角动量能够以流体涡旋的形式传递到反应过程产生的夸克-胶子等离子体中(Quark-Gluon Plasma,QGP),QGP中的夸克和胶子通过自旋-轨道相互作用将沿着系统轨道角动量方向极化,即"QGP的整体极化"效应.经过近二十年的探索,重离子碰撞中Λ超子和φ、K*0矢量介子的整体极化的实验数据证实了 QGP整体极化的新现象,这引起了研究人员的广泛关注,成为高能核物理前沿新的热点研究方向.本文简略描述重离子碰撞中整体极化的实验测量,聚焦在Λ超子的整体极化和φ、K*0矢量介子的自旋排列,并讨论实验数据给出的物理信息.
Abstract
The huge orbital angular momentum generated by non-central relativistic heavy-ion collisions in the reaction zone can be transferred to the quark-gluon plasma(QGP)in the form of fluid vortices.Partons in the QGP will be polarized along the angular momentum through the spin-orbit interaction,the so-called"Globla Polarization".After nearly two decades of ex-ploration,experimental data on the global polarization of Λ hyperons and φ,K*0 vector mesons in heavy-ion collisions have confirmed a new phenomenon of QGP global polarization,which has attracted widespread attention from researchers and be-come a new hot direction in the forefront of high-energy nuclear physics.This paper briefly describe the experimental meas-urements of global polarization in heavy-ion collisions,focusing on the global polarization of Λ hyperons and the spin align-ment of φ,K*0 mesons,followed by a brief discussion of the physics information provided by the experimental data.
关键词
重离子碰撞/QGP的整体极化/超子极化/矢量介子自旋排列Key words
heavy-ion collision/QGP global polarization/hyperon polarization/vector meson spin alignment引用本文复制引用
基金项目
国家重点研发计划资助项目(2022YFA1604900)
国家自然科学基金资助项目(12025501)
出版年
2024
NETL
NSTL
万方数据