J/ψ polarization in relativistic heavy ion collisions

被引：0

作者：

Zhao, Jiaxing ^{[1
]}

Chen, Baoyi ^{[2
]}

机构：

[1] Univ Nantes, SUBATECH, IMT Atlantique, CNRS,IN2P3, 4 Rue Alfred Kastler, F-44307 Nantes 3, France

[2] Tianjin Univ, Dept Phys, Tianjin 300354, Peoples R China

来源：

EUROPEAN PHYSICAL JOURNAL C | 2024年 / 84卷 / 08期

基金：

中国国家自然科学基金;

关键词：

SHORT-DISTANCE ANALYSIS; TRANSVERSE-MOMENTUM; J-PSI; HADRONIC PRODUCTION; QUARK SYSTEMS; PP COLLISIONS; SUPPRESSION; CHARMONIUM; REGENERATION; RAPIDITY;

D O I：

10.1140/epjc/s10052-024-13264-w

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

Understanding the polarization property of J/psi is critical to constrain its production mechanism. In addition, the polarization of J/psi can reveal the impact of strong electromagnetic and vorticity fields in relativistic heavy ion collisions. In this study, we analyzed the yield and polarization of J/psi in relativistic heavy ion collisions at different centrality and transverse momentum regions, using three different reference frames: the Collins-Soper frame, the helicity frame, and the event plane frame. The polarization of initially produced J/psi is determined by the NRQCD calculation and is similar to that of pp collisions. However, both unpolarization and transverse polarization are considered for the regenerated J/psi. Our results indicate that the polarization at high pT is similar to that observed in pp collisions. However, at low pT, where regenerated J/psi dominates, it is likely that the polarized charm quarks in the rotational QGP medium are responsible for this phenomenon. Our study supplies a baseline for future research on the effects of strong electromagnetic and vorticity fields on J/psi polarization.

引用

页数：7

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