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  • Open Access

Search for CP violations in the production and decay of hyperon-antihyperon pairs

Mengjiao Guo1, Zhe Zhang2,*, Ronggang Ping3,4,†, and Jianbin Jiao1,‡

  • *Contact author: zhangzhe@impcas.ac.cn
  • †Contact author: pingrg@ihep.ac.cn
  • ‡Contact author: jiaojb@sdu.edu.cn
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Phys. Rev. D 113, 036019 – Published 23 February, 2026

DOI: https://doi.org/10.1103/tfxw-62m2

Abstract

This study introduces a complete joint angular distribution analysis for the process e+e−→J/ψ→B(→B1π)B¯(→B¯1π) with polarized beams, where B and B1 are hyperons. We consider both transverse and longitudinal beam polarization and analyze CP violation in the production and decay of hyperons. We present the complete Fisher information matrix for the sensitivities of the weak decay parameters α−,α+,ϕΞ, and ϕ¯Ξ, the P-violating term FA, and the EDM dB (derived from the CP-violating term HT), under the BESIII and STCF statistics. We find that polarization enhances the sensitivity of the parameters. Specifically, longitudinal polarization provides a more significant improvement compared to transverse polarization, with the enhancement being more pronounced for single-step decays than for multistep decays. With the expected statistics from the BESIII experiment, the estimated EDM sensitivities for Λ and Σ+ are on the order of 10−19  e cm, while those for Ξ− and Ξ0 are 10−18  e cm. The upcoming STCF experiment is expected to improve these estimates by 1–2 orders of magnitude. Furthermore, CP violation in hyperon decays originates from weak-phase differences among partial-wave amplitudes. Based on a refined isospin analysis, we emphasize the non-negligible contribution of ΔI=3/2 amplitudes to CP violation and advocate for increased theoretical attention to this aspect in future studies.

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Phys. Rev. D 113, 036019– Published 23 February, 2026
  • Received 28 February 2025
  • Accepted 26 January 2026
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