Heavy-flavor-conserving hadronic weak decays of heavy baryons

Hai Yang Cheng*, Chi Yee Cheung, Guey-Lin Lin, Yeu Chung Lin, Tung Mow Yan, Hoi Lai Yu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


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.

Original languageEnglish
Article number28
JournalJournal of High Energy Physics
Issue number3
StatePublished - 1 Mar 2016


  • Chiral Lagrangians
  • Heavy Quark Physics

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