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arXiv 2606.06263hep-phhep-thnucl-th
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夸克偶素内夸克的自旋-轨道关联

Spin-orbit correlation of quarks within quarkonium

Institute of Modern Physics, Chinese Academy of Sciences(中国科学院近代物理研究所);School of Nuclear Science and Technology, University of Chinese Academy of Sciences(中国科学技术大学核科学技术学院);Department of Modern Physics, University of Science and Technology of China(中国科学技术大学现代物理系);Department of Physics and Astronomy, Iowa State University(爱荷华州立大学物理与天文学系);School of Physics, Zhengzhou University(郑州大学物理学院);Anhui Center for Fundamental Sciences in Theoretical Physics(安徽理论物理基础科学中心)

Tianyang Hu, Xianghui Cao, Siqi Xu, Weijie Du, Qin-Tao Song, Yang Li

AI总结:

通过宇称奇能量-动量张量定义自旋-轨道关联,利用光前动力学非微扰框架计算粲偶素和B_c介子的横向与纵向分布,揭示部分子动力学信息。

摘要:

自旋-轨道关联(SOC)为强子内部自旋结构提供了独特的探针。通过宇称奇(P-odd)能量-动量张量(EMT)定义的这一可观测量,即使在总角动量为零的系统中也可以保持非零。在本研究中,我们将SOC的形式场论定义与利用光前动力学的非微扰量子多体框架联系起来。此外,我们展示了如何直接从P-odd EMT的强子矩阵元中提取SOC,为在部分子图像中访问这一可观测量建立了途径。作为实际应用,我们计算了粲偶素和$B_c$介子的横向和纵向SOC分布。虽然我们的结果与基于Clebsch-Gordan分解的粗略估计一致,但我们证明了这些可观测量提供了关于部分子动力学的丰富、非平凡的信息。

英文摘要:

The spin-orbit correlation (SOC) provides a unique probe into the internal spin structure of hadrons. Defined via the parity-odd (P-odd) energy-momentum tensor (EMT), this observable can remain non-vanishing even in systems where the total angular momentum is zero. In this study, we connect the formal field-theoretical definition of the SOC to a non-perturbative quantum many-body framework utilizing light-front dynamics. Furthermore, we show how the SOC can be extracted directly from the hadronic matrix elements of the P-odd EMT, establishing a pathway to access this observable within the partonic picture. As a practical application, we compute the transverse and longitudinal SOC distributions for charmonium and $B_c$ mesons. While our findings align with rough estimates based on the Clebsch-Gordan decomposition, we demonstrate that these observables yield rich, non-trivial information regarding partonic dynamics.

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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