Abstract: More than two decades ago, we studied heavy-flavor-conserving weak decays of heavy baryons within the framework that incorporates both heavy-quark and chiral symmetries. In view of the first observation of Ξb − → Λb 0π− by LHCb recently, we have reexamined these decays and presented updated predictions. The predicted rates for Ξb − → Λb 0π− in the MIT bag and diquark models are consistent with experiment. The major theoretical uncertainty stems from the evaluation of baryon matrix elements. The branching fraction of Ξc → Λcπ is predicted to be of order 10−4. It is suppressed relative to (Formula presented.) owing to the shorter lifetime of Ξc relative to Ξb and the destructive nonspectator W-exchange contribution. The kinematically accessible weak decays of the sextet heavy baryon ΩQ are ΩQ → ΞQπ. Due to the absence of the (Formula presented.) transition in the heavy quark limit and the (Formula presented.) transition in the model calculations, ΩQ → ΞQπ vanish in the heavy quark limit.
- Chiral Lagrangians
- Heavy Quark Physics