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Hyperon Physics at BESIII

by Viktor Thorén

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Submission summary

Authors (as registered SciPost users): Viktor Thorén
Submission information
Preprint Link:  (pdf)
Date accepted: 2023-07-06
Date submitted: 2023-02-28 12:04
Submitted by: Thorén, Viktor
Submitted to: SciPost Physics Proceedings
Proceedings issue: 51st International Symposium on Multiparticle Dynamics (ISMD2022)
Ontological classification
Academic field: Physics
  • High-Energy Physics - Experiment
Approach: Experimental


Spin polarization and entanglement are utilized by the BESIII experiment to learn more about the production and decay properties of hyperon-antihyperon pairs in a series of recent analyses of its unprecedented datasets at the $J/\psi$ and $\psi'$ resonances. This has lead to the observation of significant transverse polarisation in decays of $J/\psi$ or $\psi'$ into $\Lambda \bar{\Lambda}$, $\Sigma \bar{\Sigma}$, $\Xi \bar{\Xi}$, and $\Omega \bar{\Omega}$. Because of the non-zero polarization, the decay parameters for the most common hadronic weak decays of both hyperons and antihyperons could be determined independently for the first time. Comparing these to each other yields precise tests of direct, $\Delta S = 1$ CP-violation that complement measurements of kaon decays.

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Published as SciPost Phys. Proc. 15, 026 (2024)

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