Large apparent SU(3)F breaking and a tension with lattice QCD have recently emerged in semileptonic decays of singly charmed baryons, hinting at either an unexpected hadronic mechanism or new physics. We formulate a framework that systematically matches lattice-QCD inputs onto an SU(3)F analysis including first-order symmetry breaking. We predict B(Ξc+→Σ0ℓ+νℓ)/B(Ξc+→Ξ0ℓ+νℓ)=(2.6±0.3)%, and B(Ξc+→Λ0ℓ+νℓ)/B(Ξc+→Ξ0ℓ+νℓ)=(1.1±0.1)%, whose precise measurements would cleanly determine the origin of the anomalously large SU(3)F breaking.
@article{arxiv.2603.16323,
title = {Puzzles in charmed baryon semileptonic decays},
author = {Chao-Qiang Geng and Chia-Wei Liu and Sheng-Lin Liu},
journal= {arXiv preprint arXiv:2603.16323},
year = {2026}
}