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

2025/04/02 by Qi Chen, Chen, Qi, Xin Wu +5 · 1 citation
Physics and Astronomy · #Particle physics theoretical and experimental studies #Dark Matter and Cosmic Phenomena #Particle Detector Development and Performance

paper · pdf · doi:10.48550/arxiv.2504.01853

Abstract

Motivated by the recent CPV observation, we investigate the CPV 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 Λ_b decays. For giving more useful predictions, we also give a simple dynamic analysis. By counting the power(λ=√\fracΛ_QCDm_b) of each topological diagram, we find that for the specific decay B_b²→ R(B₁² M² M ²)M², only one U-spin amplitude can contribute in the leading power, while for B_b²→ R(B₁² M²)R( M ²M²), only two U-spin amplitudes can contribute in this leading power. Then the most effective prediction can be given as amp;A_CP^dir(Λ_b⁰ → R( p π^- π⁺ )π^-) = (-12.99 ± 2.83±2.59±0.65)%,Considering the Λ_b can effectively produced in LHCb, we strongly encourage a more precise experimental investigation of it.

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• U-spin sum rules for two-body decays of bottom baryons

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