Spin alignment of vector mesons induced by local spin density fluctuations

被引：0
|
作者：
Xu, Kun [1 ,2 ]
Huang, Mei [2 ]
机构：
[1] Beijing Inst Technol, Beijing 100080, Peoples R China
[2] Univ Chinese Acad Sci, Sch Nucl Sci & Technol, Beijing 100049, Peoples R China
来源：
PHYSICAL REVIEW D | 2024年 / 110卷 / 09期
基金：
中国国家自然科学基金;
关键词：
JONA-LASINIO MODEL; POLARIZATION; QCD;
D O I：
10.1103/PhysRevD.110.094034
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We propose a novel mechanism that the spin alignment of vector meson phi and K-*0 in most central heavy ion collisions is induced by intrinsic quantum chromo dynamics (QCD) without external vortical/magnetic fields. The local spin density fluctuation of quarks due to the axial-vector and tensor interactions between quarks can induce the spin alignments of vector meson. It is found that axial-vector interaction results in rho(00) < 1/3 for the spin alignment of phi meson, while tensor interaction results in rho(00) > 1/3. We argue that the spin alignment of K-*0 due to the spin density fluctuation from flavor-mixing would be a signature or hint of instanton.
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页数：10
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