Spin alignment of vector mesons from quark dynamics in a rotating medium

被引：6
|
作者：
Wei, Minghua [1 ]
Huang, Mei [2 ]
机构：
[1] Fudan Univ, Inst Modern Phys, Shanghai 200433, Peoples R China
[2] Univ Chinese Acad Sci, Sch Nucl Sci & Technol, Beijing 100049, Peoples R China
来源：
CHINESE PHYSICS C | 2023年 / 47卷 / 10期
基金：
中国国家自然科学基金;
关键词：
spin alignment; QCD medium; vector meson; QUANTUM-FIELD-THEORY; JONA-LASINIO MODEL; MAGNETIC-FIELD; POLARIZATION; TEMPERATURE;
D O I：
10.1088/1674-1137/acf036
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：
Vorticities in heavy-ion collisions (HICs) are supposed to induce spin alignment and polarization phenomena of quarks and mesons. In this work, we analyze the spin alignment of vector mesons f and ? induced by rotation from quark dynamics in the framework of the Nambu-Jona-Lasinio (NJL) model. The rotating angular velocity induces mass splitting of spin components for vector ?,? mesons M-?,M-?(?) ? M-?,M-?(? = 0) - s(z)?. This behavior contributes to the spin alignment of vector mesons ?,? in an equilibrium medium and naturally explains the negative deviation ?(00) of -1/3 for vector mesons. Incidentally, the positive deviation ?(00) of -1/3 under the magnetic field can also be easily understood from quark dynamics.
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页数：13
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