Puzzles in charmed baryon semileptonic decays
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866908893482844160 |
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| author | Geng, Chao-Qiang Liu, Chia-Wei Liu, Sheng-Lin |
| author_facet | Geng, Chao-Qiang Liu, Chia-Wei Liu, Sheng-Lin |
| contents | 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 ${\mathcal{B}}(Ξ_c^+\toΣ^0\ell^+ν_\ell)/{\mathcal{B}}(Ξ_c^+\toΞ^0\ell^+ν_\ell)=(2.6\pm0.3)\%,$ and ${\mathcal{B}}(Ξ_c^+\toΛ^0\ell^+ ν_\ell)/{\mathcal{B}}(Ξ_c^+\toΞ^0\ell^+ν_\ell)=(1.1\pm0.1)\%$, whose precise measurements would cleanly determine the origin of the anomalously large $SU(3)_F$ breaking. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_16323 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Puzzles in charmed baryon semileptonic decays Geng, Chao-Qiang Liu, Chia-Wei Liu, Sheng-Lin High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Lattice 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 ${\mathcal{B}}(Ξ_c^+\toΣ^0\ell^+ν_\ell)/{\mathcal{B}}(Ξ_c^+\toΞ^0\ell^+ν_\ell)=(2.6\pm0.3)\%,$ and ${\mathcal{B}}(Ξ_c^+\toΛ^0\ell^+ ν_\ell)/{\mathcal{B}}(Ξ_c^+\toΞ^0\ell^+ν_\ell)=(1.1\pm0.1)\%$, whose precise measurements would cleanly determine the origin of the anomalously large $SU(3)_F$ breaking. |
| title | Puzzles in charmed baryon semileptonic decays |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Lattice |
| url | https://arxiv.org/abs/2603.16323 |