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

中国物理C:英文版 2023年第9期47卷 27-42页

作者：张哲宋娇娇 Key Laboratory of Particle Physics and Particle Irradiation(MOE) Institute of Frontier and Interdisciplinary ScienceShandong UniversityQingdao 266237China School of Physics He’nan Normal UniversityXinxiang 453007China

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.

关键词： spin density matrix helicity formalism polarization alignment spin-3/2

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Study of parity violation inΛ^(+)_(c)→ΦρandΛ^(+)_(c)→ωρdecays

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Chinese Physics C 2023年第5期47卷 49-56页

作者：洪鹏程严芳平荣刚罗涛 Institute of Modern Physics Fudan UniversityShanghai 200433China Institute of High Energy Physics Chinese Academy of ScienceBejing 100049China University of Chinese Academy of Science Chinese Academy of ScienceBeijing 100049China

CP violation in baryonic decays has not been significantly *** large data events accumulated at e+e-colliders or the Large Hadron Collider,charmed baryon decays would provide a promising laboratory to test CP *** this study,we formulateΛ^(+)_(c)→ΦρandΛ^(+)_(c)→ωρdecays for the measurement of their asymmetry parameters in weak decays at the BESII or LHCb *** polarization transfer is analyzed in the two processes of e+e-→Λ^(+)_(c)Λ^(-)_(c)andΛ^(o)_(b)→Λ^(+)_(c)π^(-),and the formulas for the joint angular distribution of these processes are *** sensitivity of the measurement of the asymmetry parameters of the above two decay processes is estimated for future experiments.

关键词： parity violation asymmetry parameters sensitivity spin density matrix angular distribution

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Phenomenological study of J/ψ→Ξ^(0)(Λπ^(0))ˉΞ^(0)(Λγ)decays

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中国物理C:英文版 2023年第9期47卷 52-60页

作者：洪鹏程平荣刚宋维民李贺周小蓉 College of Physics Jilin UniversityChangchun 130012China Institute of High Energy Physics Beijing 100049China Department of Modern Physics University of Science and Technology of ChinaHefeiChina

The measurement of decay parameters is one of the important goals of particle physics experiments,and the measurement serves as a probe to search for evidence of CP violation in baryonic *** experimental results will aid in advancing existing theoretical research and establishing new experimental *** this study,we formulate the asymmetric parameters that characterize parity violation,and then derive formulas for the measurement of CP *** formulae for the joint angular distribution of the full decay chain as well as the polarization observable of Ξ^(0),Ξ¯^(0),Λ,and Λ¯are also provided for ***,we evaluated the sensitivity of two asymmetric parameters:αΞ0→Λπ0(abbreviated asαΞ0)andαΞ¯0→Λ¯γ(abbreviated asαΞ¯0)for future experimental measurements.

关键词： parity violation asymmetry parameters spin density matrix angular distribution sensitivity

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