The LHCb Collaboration has recently reported the first observation of the decay Bˉs0→Λc+Λˉc−, along with measurements of the branching fractions for both Bˉ0→Λc+Λˉc− and Bˉs0→Λc+Λˉc−. In this work, we investigate these two decays within the framework of final state re-scattering. Our results show that the predicted branching fractions are consistent with the experimental measurements, indicating the significant role of long-distance final-state interactions in such baryonic B decays. Furthermore, we present predictions for the direct CP asymmetries and the asymmetry parameters. Numerically, both decays exhibit nearly vanishing CP asymmetries, while Bˉ0→Λc+Λˉc− displays a sizable longitudinal polarization, providing a sensitive observable for testing our theoretical framework in future experimental measurements.
@article{arxiv.2605.18574,
title = {Final-state rescattering in $\bar{B}^{0}_{(s)}\to \Lambda^{+}_{c}\bar{\Lambda}^{-}_{c}$ decays},
author = {Zhu-Ding Duan and Xiao Huang and Dong-Hao Li and Run-Hui Li and Jian-Peng Wang and Fu-Sheng Yu},
journal= {arXiv preprint arXiv:2605.18574},
year = {2026}
}