Charmed baryon decays at Belle and Belle II

Abstract

Belle and Belle II experiments have collected $e^{+}{e}^{-}$ collision data with center-of-mass energies at or near the ${\rm Y}(4S)$ resonance. Using total $1.4{\mathrm{ab}}^{-1}$ combined dataset, we present new measurements of branching fractions for ${\Xi }_c^{0/+}$ and ${\Lambda }_c^{+}$ baryons, including several first observations. Additionally, we report the initial search for $CP$ violation in singly Cabibbo-suppressed three-body decays of charmed baryons, providing a test of $U$-spin symmetry.

Comments: 4 pages, 2 figures, conference proceedings for Baryons 2025, on behalf of the Belle II Collaboration