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Vector meson's spin alignments in high energy reactions

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The global spin alignment of vector mesons has been observed by the STAR collaboration at the Relativistic Heavy Ion Collider(RHIC)at Brookhaven National Laboratory(BNL).It provides a unique opportunity to probe the correlation between the po-larized quark and antiquark in the strongly coupled quark-gluon plasma(sQGP)produced in relativistic heavy ion collisions,opening a new window to explore the properties of sQGP.In addition,spin alignments of vector mesons have also been observed in other high-energy particle collisions such as e+e-annihilations at high energies where hadron production is dominated by quark fragmentation mechanism.The results obtained are quite different from those obtained in heavy ion collisions where quark coalescence/combination mechanism dominates suggesting strong dependence on hadronization mechanisms.So comprehensive studies in different hadronization processes are needed.In this article,we present a brief review of theoretical and experimen-tal advances in the study of vector meson's spin alignments in a variety of high-energy particle collisions,with emphasis on hadronization mechanisms.

vector mesonspin alignmentglobal polarizationrelativistic heavy ion collisionsfragmentation

Jin-Hui Chen、Zuo-Tang Liang、Yu-Gang Ma、Xin-Li Sheng、Qun Wang

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Key Laboratory of Nuclear Physics and Ion-beam Application(MoE),Institute of Modern Physics,Fudan University Shanghai 200433,China

Institute of Frontier and Interdisciplinary Science,Key Laboratory of Particle Physics and Particle Irradiation(MOE),Shandong University,Qingdao 266237,China

INFN-Firenze,Sesto Fiorentino FI 50019,Italy

Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China

School of Mechanics and Physics,Anhui University of Science and Technology,Huainan 232001,China

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2025

10.1007/s11433-024-2495-1

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

影响因子：0.91
ISSN：1674-7348
年,卷(期)：2025.68(1)