Recent Advances in Charmed Baryon Measurements at Belle and Belle II

We review recent experimental progress in charmed baryon physics achieved by the Belle and Belle II experiments, with an emphasis on measurements reported since 2022. Using large e+e− data samples collected at or near the Υ(4S) resonance, Belle and Belle II have delivered a series of precision results on hadronic weak decays of anti-triplet charmed baryons, providing critical inputs for testing flavor-symmetry approaches and dynamical models. We summarize new and improved branching fraction determinations for Ξc0, Ξc+, and Λc+ decays, including channels with neutral hadrons in the final state and the first measurements of several singly Cabibbo-suppressed modes. We also highlight the first determination of the decay asymmetry parameter in Ξc0→Ξ0π0. In addition, we review the first Belle II measurements of CP asymmetries in three-body singly Cabibbo-suppressed decays of Ξc+ and Λc+, and we discuss their implications for U-spin sum rules and searches for physics beyond the Standard Model. Finally, we look forward to exploiting the Belle II data set to perform more stringent tests of decay dynamics.