Spin density matrix forΩ−and its polarization alignment in ψ(3686)→Ω−Ω¯^(+)

作     者：张哲 宋娇娇 Zhe Zhang;Jiao-Jiao Song

作者机构：Key Laboratory of Particle Physics and Particle Irradiation(MOE)Institute of Frontier and Interdisciplinary ScienceShandong UniversityQingdao 266237China School of PhysicsHe’nan Normal UniversityXinxiang 453007China 

出 版 物：《中国物理C:英文版》 (Chinese Physics C)

年 卷 期：2023年第47卷第9期

页      面：27-42页

核心收录：

学科分类：0709[理学-地质学] 08[工学] 0708[理学-地球物理学] 0804[工学-仪器科学与技术] 0827[工学-核科学与技术] 082701[工学-核能科学与工程] 0703[理学-化学] 0704[理学-天文学] 0702[理学-物理学] 

基　　金：Supported by the National Natural Science Foundation of China(12247121) 

主　　题：spin density matrix helicity formalism polarization alignment spin-3/2 

摘      要：We investigate the spin density matrix of Ω− in the Cartesian coordinate system of baryon-antibaryon pairs produced in e+e−*** the helicity formalism of Jacob and Wick,we derive the expression for the spin-3/2 density *** analysis is based on the angular distribution of the process e+e−→ψ(3686)→Ω−Ω¯^(+ )in the BESIII *** decomposing the polarization state of Ω− particles along different coordinate axes,we examine the polarization dependence of the *** results demonstrate that Ω− particles exhibit varying degrees of tensor polarization along the x-,y-,and z-axes,as well as weak vector polarization and rank-3 tensor polarization along the *** the best of our knowledge,this is the first study to calculate the polarization dependence of the cross-section distributions for the annihilation process e+e−→Ω−Ω¯^(+).Our theoretical predictions are in good agreement with the experimental measurements.