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arXiv · 2603.16323

Puzzles in charmed baryon semileptonic decays with $SU(3)_F$ flavor symmetry and lattice inputs

Chao-Qiang Geng·Chia-Wei Liu·Sheng-Lin Liu
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Abstract

Recent measurements of charmed-baryon semileptonic decays signal large tensions between experiment and theory, including $SU(3)_F$ analyses and lattice-quantum chromodynamics simulations. Possible sources of the discrepancy include the experimental normalization mode $\Xi_c^0 \to \Xi^- \pi ^+$. Using lattice-QCD inputs in an $SU(3)_F$ analysis including first-order symmetry breaking, we predict ${\cal B}( \Xi_c^+ \to \Sigma^0 \ell^+ \nu_\ell ) / {\cal B}( \Xi_c^+ \to \Xi^0 \ell^+ \nu_\ell )=(2.6\pm0.3)\%, $ and ${\cal B}( \Xi_c^+ \to \Lambda \ell^+ \nu_\ell )/{\cal B}( \Xi_c^+ \to \Xi^0 \ell^+ \nu_\ell )=(1.1\pm0.1)\%, $ with $\ell^+=(e^+,\mu^+)$. These ratios provide normalization-independent tests and may help clarify the origin of the present tension.

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Chao-Qiang Geng, Chia-Wei Liu, Sheng-Lin Liu. 2026-03-17. Puzzles in charmed baryon semileptonic decays with $SU(3)_F$ flavor symmetry and lattice inputs. https://doi.org/10.1103/h61y-61xw

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