Final-state rescattering in $\bar{B}^{0}_{(s)}\to Λ^{+}_{c}\barΛ^{-}_{c}$ decays

Abstract

The LHCb Collaboration has recently reported the first observation of the decay $\bar B_s^0\to Λ_c^+\barΛ_c^-$, along with measurements of the branching fractions for both $\bar B^0\to Λ_c^+\barΛ_c^-$ and $\bar B_s^0\to Λ_c^+\barΛ_c^-$. 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 $\bar B^0\to Λ_c^+\barΛ_c^-$ displays a sizable longitudinal polarization, providing a sensitive observable for testing our theoretical framework in future experimental measurements.