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Predictions for $C P$ violation in antitriplet beauty baryon to charmonium decays

Jin Sun ¹, Zhi-Peng Xing ^2,*, and Xiao-Gang He ³

¹Particle Theory and Cosmology Group, Center for Theoretical Physics of the Universe, Institute for Basic Science (IBS), Daejeon 34126, Korea
²Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing, Jiangsu 210023, China
³State Key Laboratory of Dark Matter Physics, Tsung-Dao Lee Institute and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 201210, China

^*Contact author: zpxing@nnu.edu.cn

Phys. Rev. D 113, 113011 – Published 18 June, 2026

DOI: https://doi.org/10.1103/ndrh-qxlq

Abstract

Motivated by the recent $3.9 σ$ evidence for $C P$ violation from the LHCb collaboration in decays of an antitriplet beauty baryon to a charmonium, an octet baryon, and a pseudoscalar meson, we perform, for the first time, a systematic analysis of this class of decays within the framework of flavor $S U (3)$ symmetry. Several predictions for branching ratios and $C P$ violating relations that can be tested in future experiments are found, in particular $Δ A_{C P} = A_{C P} (Λ_{b}^{0} \to p π^{-} J / ψ) - A_{C P} (Λ_{b}^{0} \to p K^{-} J / ψ) = A_{C P} (Λ_{b}^{0} \to n π^{0} J / ψ) - A_{C P} (Λ_{b}^{0} \to (n K_{S}, n K_{L}) J / ψ)$ . Our results provide guidance to test the availability of $S U (3)$ symmetry and search for possible $C P$ violation effects in this class of decays.

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Phys. Rev. D 113, 113011– Published 18 June, 2026

Vol. 113, Iss. 11 — 1 June 2026

Received 23 January 2026
Accepted 11 May 2026

DOI: https://doi.org/10.1103/ndrh-qxlq

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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Predictions for $C P$ violation in antitriplet beauty baryon to charmonium decays

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Predictions for CP violation in antitriplet beauty baryon to charmonium decays

Abstract

Physics Subject Headings (PhySH)

Article Text

References (26)

Predictions for $C P$ violation in antitriplet beauty baryon to charmonium decays