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 ${\Xi }_c^0\to {\Lambda }_c^{+}{\pi }^{-}$ and ${\Xi }_b^{-}\to {\Lambda }_b^0{\pi }^{-}$ are both in agreement with current experimental results. For the yet-to-be-measured heavy-flavor-conserving decays, we find $\mathcal{B}({\Xi }_c^{+}\to {\Lambda }_c^{+}{\pi }^0)=(13.8\pm 1.4)\times 10^{-3}$, $\mathcal{B}({\Xi }_b^0\to {\Lambda }_b^0{\pi }^0)=(2.6\pm 0.3)\times 10^{-3}$, $\mathcal{B}({\Omega }_c^0\to {\Xi }_c^{+}{\pi }^{-})=(2.0\pm 0.2)\times 10^{-3}$ and $\mathcal{B}({\Omega }_c^0\to {\Xi }_c^0{\pi }^0)=(1.1\pm 0.1)\times 10^{-3}$. They are all accessible to LHCb, Belle and Belle II and can be tested in the near future.

Comments: 25 pages