Update on splitting of lifetimes of $c$ and $b$ hyperons within the heavy quark expansion and decays ${\Xi }_Q\to {\Lambda }_Q\pi$

Abstract

It is argued that the results of recent precision measurements by LHCb of the lifetimes of charmed and bottom hyperons are very well consistent with the description within heavy quark expansion and allow to accurately determine matrix elements of light-flavor nonsinglet four-quark operators over the hyperons and to accurately reproduce the difference of lifemes of ${\Lambda }_b$ and ${\Xi }_b^{-}$. When combined with the recent LHCb results on the decay ${\Xi }_b^{-}\to {\Lambda }_b{\pi }^{-}$ this leads to prediction of a lower bound on the rate of the decays ${\Xi }_c\to {\Lambda }_c\pi$.

arXiv comment10 pages

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Cited by in corpus (8)

• Charmed Baryon Physics Circa 2021
• First branching fraction measurement of the suppressed decay ${\Xi }_c^0\to {\pi }^{-}{\Lambda }_c^{+}$
• Study of heavy quark conserving weak decays in the quark model
• Topological tensor invariants and the current algebra approach: Analysis of 196 nonleptonic two-body decays of single and double charm baryons -- a review
• Heavy-Flavor-Conserving Hadronic Weak Decays of Charmed and Bottom Baryons
• Heavy-Flavor-Conserving Hadronic Weak Decays of Charmed and Bottom Baryons: an Update
• 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