2023/12/29 by Xiongfei Wang, Wang, Xiongfei
Physics and Astronomy · #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #High-Energy Particle Collisions Research
paper · pdf · doi:10.48550/arxiv.2312.17486
The BESIII detector on the BEPCII collider collected the world's largest dataset at the peaks of J/ψ, ψ(3686) and ψ(3770). The use of polarization and entanglement states in multidimensional angular distribution analysis can provide new probes to the production and decay characteristics of hyperon anti hyperon pairs. In a recent series of studies, significant transverse polarization in hyperon decay has been observed in J/ψ, ψ(3686) decaying into the ΛΛ, Σ+Σ-, Ξ0Ξ0 and Ξ-Ξ+ final states. The weak decay parameters of hyperons and antihyperons are also independently determined for the first time. The most accurate testing for direct CP violation has been achieved based on the measured weak decay parameters.