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Disentangling isospin violation in charmonia decaying into ΞΞ¯ pairs

Huan-Ran Wen1,2, Chun-Qiu Zhao1,3,*, Xu Cao1,2,4,†, and Jian-Ping Dai3,‡

  • *Contact author: zhaochunqiu@stu.ynu.edu.cn
  • †Contact author: caoxu@impcas.ac.cn
  • ‡Contact author: daijianping@ynu.edu.cn
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Phys. Rev. D 114, 054052 – Published 28 September, 2026

DOI: https://doi.org/10.1103/1jj9-jzz7

Abstract

Based on a model-independent isospin decomposition, we perform a data-driven analysis of J/ψ and ψ(2S) decays into ΞΞ¯ pairs by leveraging the full set of observables from high-statistics BESIII data. We find that the isospin-violating amplitudes are predominantly driven by the electric couplings, with magnitudes reaching approximately 10%, contrasting with the smaller magnetic contributions of about 3%. A partial-wave analysis further reveals that S-wave isospin violation is comparable to the D-wave contribution.

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Phys. Rev. D 114, 054052– Published 28 September, 2026
  • Received 24 August 2026
  • Accepted 8 September 2026
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