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  • Letter
  • Open Access

Probing hyperon electric dipole moments with a full angular analysis

Jinlin Fu1,*, Hai-Bo Li1,2, Jian-Peng Wang3,4,†, Fu-Sheng Yu3,4,5, and Jianyu Zhang1,‡

  • 1School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
  • 2Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
  • 3MOE Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou 730000, People’s Republic of China
  • 4School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, People’s Republic of China
  • 5Center for High Energy Physics, Peking University, Beijing 100871, People’s Republic of China

  • *jinlin.fu@ucas.ac.cn
  • †wangjp20@lzu.edu.cn
  • ‡zhangjianyu@ucas.ac.cn
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Phys. Rev. D 108, L091301 – Published 13 November, 2023

DOI: https://doi.org/10.1103/PhysRevD.108.L091301

Abstract

The electric dipole moment (EDM) of elementary particles, arising from flavor-diagonal CP violation, serves as a powerful probe for new physics beyond the Standard Model and holds the potential to provide novel insights in unraveling the puzzle of the matter-dominated Universe. Hyperon EDM is a largely unexplored territory. In this paper, we present a comprehensive angular analysis that focuses on entangled hyperon-antihyperon pairs in J/ψ decays for the indirect extraction of hyperon EDM. The statistical sensitivities are investigated for BESIII and the proposed Super Tau-Charm Facility (STCF). Leveraging the statistics from the BESIII experiment, the estimated sensitivity for Λ EDM can reach an impressive level of 10−19  e cm, achieving a 3-orders-of-magnitude improvement over the only existing measurement in a fixed-target experiment at Fermilab with similar statistics. The estimated sensitivities for the Σ+, Ξ−, and Ξ0 hyperons at the same level of 10−19  e cm will mark the first-ever achievement and the latter two will be the first exploration of hyperons with two strange valence quarks. The EDM measurements for hyperons conducted at the BESIII experiment will be a significant milestone and serve as a litmus test for new physics such as supersymmetry and the left-right symmetrical model. Furthermore, at the STCF experiment, the sensitivity of hyperon EDM measurements can be further enhanced by 2 orders of magnitude. Additionally, this angular analysis enables the determination of CP violation in hyperon decays, the effective weak mixing angle, and beam polarization.

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Phys. Rev. D 108, L091301– Published 13 November, 2023
  • Received 3 August 2023
  • Accepted 20 October 2023
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