Heavy-Flavor-Conserving Hadronic Weak Decays of Charmed and Bottom Baryons: an Update

Abstract

This paper serves as an update of the previous work entitled ``Heavy-Flavor-Conserving Hadronic Weak Decays of Charmed and Bottom Baryons". We make an improvement on the bag wave functions by removing the center-of-mass motion of the bag. All the baryon matrix elements are now calculated under the same framework without introducing new parameters. The matrix elements of 4-quark operators are found to be nearly twice larger than the previous ones. The calculated branching fractions of $ Ξ_c ^0 \to Λ_c ^+π^-$ and $Ξ_b^- \to Λ^0_b π^-$ are both in agreement with current experimental results. For the yet-to-be-measured heavy-flavor-conserving decays, we find ${\cal B}( Ξ_c ^+ \to Λ_c ^+π^0) = (13.8 \pm 1.4)\times 10^{-3}$, ${\cal B}( Ξ_b^0 \to Λ^0_b π^0) = (2.6 \pm 0.3)\times 10^{-3}$, ${\cal B}( Ω_c ^0 \to Ξ_c^+π^-) = (2.0 \pm 0.2)\times 10^{-3}$ and ${\cal B}( Ω_c ^0 \to Ξ_c^0π^0)= (1.1 \pm 0.1)\times 10^{-3}$. They are all accessible to LHCb, Belle and Belle II and can be tested in the near future.