Probing vorticity structure in heavy-ion collisions by local A polarization

被引：149

作者：

Xia, Xiao-Liang ^{[1
]}

Li, Hui ^{[1
]}

Tang, Zebo ^{[1
]}

Wang, Qun ^{[1
]}

机构：

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

来源：

PHYSICAL REVIEW C | 2018年 / 98卷 / 02期

基金：

中国国家自然科学基金;

关键词：

LAMBDA POLARIZATION; SPIN;

D O I：

10.1103/PhysRevC.98.024905

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：

We study the local structure of the vorticity field and the A polarization in Au+Au collisions in the energy range root(NN)-N-s = 7.7-200 GeV and Pb+Pb collisions at root(NN)-N-s = 2760 GeV using a multiphase transport model. We focus on the vorticity field arising from the nonuniform expansion of the fireball, which gives the circular structure of the transverse vorticity omega(perpendicular to) = (omega(x),omega(y)) around the z direction as well as the quadrupole pattern of the longitudinal vorticity omega(z) in the transverse plane. As a consequence, the three components of the polarization vector P = (P-x,P-y,P-z) for Lambda hyperons show harmonic behaviors as sgn(Y)sin ?(p), sgn(Y)cos ?(p), and sin(2?(p)), where ?(p) and Y are the azimuthal angle and rapidity in momentum space. These patterns of the local Lambda polarization are expected to be tested in future experiments.

引用

页数：7

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