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arXiv 1906.09385nucl-th
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高能重离子碰撞中的局域自旋极化

Local spin polarization in high energy heavy ion collisions

Hong-Zhong Wu, Long-Gang Pang, Xu-Guang Huang, Qun Wang

备注：
RevTex 4, 18 pages, 9 figures. A bug has been corrected in the numerical calculation of results for the non-relativistic vorticity. A number of typos are corrected. To appear in Physical Review Research
发表信息：
Phys. Rev. Research 1, 033058 (2019)
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摘要：

在（3+1）维粘性流体动力学模型CLVisc的框架下，重新研究了200 GeV重离子碰撞中超子局域自旋极化的方位角依赖性.在我们的模拟中考虑了两种不同的初始条件：没有初始轨道角动量的光学Glauber初始条件和具有初始轨道角动量的AMPT初始条件。我们发现超子极化的方位角依赖性强烈依赖于所谓的“自旋化学势”$Ω_{μν}$的选择。选择与温度涡度成比例的$Ω_{μν}$，我们的模拟结果与最近在RHIC测量的纵向和横向极化定性一致。我们认为，这种巧合可能与热夸克-胶子物质中的温度涡度近似守恒有关。

英文摘要：

We revisit the azimuthal angle dependence of the local spin polarization of hyperons in heavy-ion collisions at 200 GeV in the framework of the (3+1)D viscous hydrodynamic model CLVisc. Two different initial conditions are considered in our simulation: the optical Glauber initial condition without initial orbital angular momentum and the AMPT initial condition with an initial orbital angular momentum. We find that the azimuthal angle dependence of the hyperon polarization strongly depends on the choice of the so-called "spin chemical potential" $Ω_{μν}$. With $Ω_{μν}$ chosen to be proportional to the temperature vorticity, our simulation shows qualitatively coincidental results with the recent measurements at RHIC for both the longitudinal and transverse polarization. We argue that such a coincidence may be related to the fact that the temperature vorticity is approximately conserved in the hot quark-gluon matter.

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