Possible large CP violation in charmed Λ_b decays

2023/09/18 by Yin-Fa Shen, Jianpeng Wang, Shen, Yin-Fa +3
Physics and Astronomy · Computer Science · #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Computational Physics and Python Applications

paper · pdf · doi:10.48550/arxiv.2309.09854

Abstract

We propose that the cascade decay Λ_b → D(→ K⁺π^-) N(→ pπ^-) may serve as the discovery channel for baryonic CP violation. This decay chain is contributed by, dominantly, the amplitudes with the intermediate D state as D⁰ or D⁰. The large weak phase between the two kinds of amplitudes suggests the possibility of significant CP violation. While the presence of undetermined strong phases may complicate the dependence of CP asymmetry, our phenomenological analysis demonstrates that CP violation remains prominent across a broad range of strong phases. The mechanism also applies to similar decay modes such as Λ_b → D(→ K⁺ K^-) Λ. Considering the anticipated luminosity of LHCb, we conclude that these decay channels offer a promising opportunity to uncover CP violation in the baryon sector.

Related

• Large CP violation in charmed baryon decays
• Large CP violation in Λ⁰_b → pK^-π⁺π^- and its U-spin partner decays
• CP violation in two-body hadronic Λ_b decays in the PQCD approach
• Probing CP Asymmetries in Charm Baryons Decays
• Establishing CP Violation in b-Baryon Decays