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  • Open Access

Implications of recent LHCb data on CP violation in b-baryon four-body decays

Qi Chen, Xin Wu, Zhi-Peng Xing*, and Ruilin Zhu

  • Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing, Jiangsu 210023, China and Nanjing Key Laboratory of Particle Physics and Astrophysics, Nanjing, Jiangsu 210023, China

  • *Contact author: zpxing@nnu.edu.cn
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Phys. Rev. D 112, 033010 – Published 25 August, 2025

DOI: https://doi.org/10.1103/skrl-gl4z

Abstract

Motivated by the recent CP violation observation, we investigate the CP violation of b-baryon charmless four-body decays under the U-spin symmetry. However, we find that only U-spin symmetry cannot provide effective predictions, particularly for Λb decays. For giving more useful predictions, we also give a simple dynamic analysis. By counting the power (λ=ΛQCDmb) of each topological diagram, we find that for the specific decay Bb2→R(B12M2M2¯)M2, only one U-spin amplitude can contribute in the leading power, while for Bb2→R(B12M2)R(M2¯M2), only two U-spin amplitudes can contribute in this leading power. Then the most effective prediction can be given as ACPdir(Λb0→R(pπ−π+)π−)=(−12.99±2.83±2.59±0.65)%.Considering the Λb can effectively be produced in LHCb, we strongly encourage a more precise experimental investigation of it.

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Phys. Rev. D 112, 033010– Published 25 August, 2025
  • Received 11 April 2025
  • Accepted 5 August 2025
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