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| Main Author: | |
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| Format: | Preprint |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2312.17486 |
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Table of Contents:
- 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 $Λ\barΛ$, $Σ^+\barΣ^{-}$, $Ξ^0\barΞ^0$ and $Ξ^-\barΞ^{+}$ 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.