Global A polarization in heavy-ion collisions from a transport model

被引：181

作者：

Li, Hui ^{[1
]}

Pang, Long-Gang ^{[2
]}

Wang, Qun ^{[1
]}

Xia, Xiao-Liang ^{[1
]}

机构：

[1] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China

[2] Frankfurt Inst Adv Studies, Ruth Moufang Str 1, D-60438 Frankfurt, Germany

来源：

PHYSICAL REVIEW C | 2017年 / 96卷 / 05期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1103/PhysRevC.96.054908

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The polarizations of A and (Lambda) over bar hyperons are important quantities in extracting the fluid vorticity of the strongly coupled quark gluon plasma and the magnitude of the magnetic field created in off-central heavy-ion collisions, through the spin-vorticity and spin-magnetic coupling. We computed the energy dependence of the global A polarization in off-central Au+Au collisions in the energy range root s(NN) = 7.7-200 GeV using a multiphase transport model. The observed polarizations with two different impact parameters agree quantitatively with recent STAR measurements. The energy dependence of the global A polarization is decomposed as energy dependence of the A distribution at hadronization and the space-time distribution of the fluid-vorticity field. The visualization of both the A distribution and the fluid-vorticity field show a smaller tilt at higher collisional energies, which indicates that the smaller global polarization at higher collisional energies is caused by a smaller angular momentum deposition at midrapidity.

引用

页数：6

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