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arXiv 2010.01474nucl-th
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相对论重离子碰撞中矢量介子的局域自旋排列

Local spin alignment of vector mesons in relativistic heavy-ion collisions

Xiao-Liang Xia, Hui Li, Xu-Guang Huang, Huan Zhong Huang

摘要:

研究了重离子碰撞中局域极化夸克和反夸克产生的矢量介子的自旋排列(局域自旋排列)。我们发现,$ρ_{00}\neq 1/3$并不一定表示夸克和反夸克沿系统轨道角动量的整体极化,也可能源于它们的局域自旋极化.这种局部自旋极化可能是由火球的各向异性膨胀引起的局部涡量引起的。我们进一步提出了实验观测值,可以区分本地和全球的自旋对齐。在重离子碰撞中测量这些可观测量可以探测涡度模式,并揭示$ϕ$和$K^{*0}$自旋排列的难题。

英文摘要:

We investigate the spin alignment of vector mesons arising from locally polarized quarks and anti-quarks (local spin alignment) in heavy-ion collisions. We find that $ρ_{00}\neq 1/3$ does not necessarily signal the global polarization of quarks and anti-quarks along the orbital angular momentum of the system, but may also originate from their local spin polarization. Such local spin polarization could be induced by local vorticity arising from the anisotropic expansion of the fireball. We further propose experimental observables that can distinguish between the local and the global spin alignments. Measurements of these observables in heavy-ion collisions can probe the vorticity pattern and shed light on the puzzles of $ϕ$ and $K^{*0}$ spin alignments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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