Heavy-flavor-conserving hadronic weak decays of heavy baryons

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 ξ −  → λ 0 π − by lhcb recently, we have reexamined these decays and presented updated predictions. the predicted rates for ξ −  → λ 0 π − 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 ξ c → λ c π is predicted to be of order 10−4. it is suppressed relative to $$ mathrm{mathcal{b}}left({xi}_bto {lambda}_bpi right) $$ owing to the shorter lifetime of ξ c relative to ξ b and the destructive nonspectator w-exchange contribution. the kinematically accessible weak decays of the sextet heavy baryon ω q are ω q → ξ q π. due to the absence of the $$ {mathrm{mathcal{b}}}_6-{mathrm{mathcal{b}}}_{{}_3^{-}} $$ transition in the heavy quark limit and the $$ {mathrm{mathcal{b}}}_6-{mathrm{mathcal{b}}}_6 $$ transition in the model calculations, ω q → ξ q π vanish in the heavy quark limit.