Heavy-Flavor-Conserving Hadronic Weak Decays of Heavy Baryons

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 ${\Xi }_b^{-}\to {\Lambda }_b^0{\pi }^{-}$ by LHCb recently, we have reexamined these decays and presented updated predictions. The predicted rates for ${\Xi }_b^{-}\to {\Lambda }_b^0{\pi }^{-}$ 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 ${\Xi }_c\to {\Lambda }_c\pi$ is predicted to be of order $10^{-4}$. It is suppressed relative to $Br({\Xi }_b\to {\Lambda }_b\pi )$ owing to the shorter lifetime of ${\Xi }_c$ relative to ${\Xi }_b$ and the destructive nonspectator $W$-exchange contribution. The kinematically accessible weak decays of the sextet heavy baryon ${\Omega }_Q$ are ${\Omega }_Q\to {\Xi }_Q\pi$. Due to the absence of the $B_6-B_{\bar{3}}$ transition in the heavy quark limit and the $B_6-B_6$ transition in the model calculations, ${\Omega }_Q\to {\Xi }_Q\pi$ vanish in the heavy quark limit.

11 pages, to appear in JHEP

References in corpus (2)

• Evidence for the strangeness-changing weak decay ${\Xi }_b^{-}\to {\Lambda }_b^0{\pi }^{-}$
• Light-Quark Decays in Heavy Hadrons

Cited by in corpus (17)

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• Sum rules for $CP$ asymmetries of charmed baryon decays in the $SU(3{)}_F$ limit
• Phenomenological Study of Heavy Hadron Lifetimes
• First branching fraction measurement of the suppressed decay ${\Xi }_c^0\to {\pi }^{-}{\Lambda }_c^{+}$
• Topological tensor invariants and the current algebra approach: Analysis of 196 nonleptonic two-body decays of single and double charm baryons -- a review
• Fragmentation-fraction ratio $f_{{\Xi }_b}/f_{{\Lambda }_b}$ in $b$- and $c$-baryon decays
• Heavy-Flavor-Conserving Hadronic Weak Decays of Charmed and Bottom Baryons
• Heavy-Flavor-Conserving Hadronic Weak Decays of Charmed and Bottom Baryons: an Update
• Charmonium decays of beauty baryons in the perturbative QCD approach
• Update on splitting of lifetimes of $c$ and $b$ hyperons within the heavy quark expansion and decays ${\Xi }_Q\to {\Lambda }_Q\pi$
• Observation and branching fraction measurement of the decay ${\Xi }_b^{-}\to {\Lambda }_b^0{\pi }^{-}$
• Study of the nonleptonic decay ${\Xi }_c^0\to {\Lambda }_c^{+}{\pi }^{-}$ in the covariant confined quark model
• Measurement of the branching fraction of ${\Xi }_c^0\to {\Lambda }_c^{+}{\pi }^{-}$ at Belle
• Revisiting heavy-flavor conserving weak decays of charmed baryons within the nonrelativistic quark model