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arXiv · 2605.23716

Semileptonic decay of $\Lambda_b^0 \to \Lambda_c (2860)^+/\Lambda_c(2625)^+\ell^-\overline{\nu}_\ell$ within QCD light-cone sum rules

Hui-Hui Duan·Jia-Bao Feng·Feng-Mei Liu·Qin Chang
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Abstract

In this work, we calculate the transition form factors for the weak decays $\Lambda_b^0 \to \Lambda_c(2860)^+$ and $\Lambda_b^0 \to \Lambda_c(2625)^+$ using QCD light-cone sum rules, and compute the branching fractions of the corresponding semileptonic decays $\Lambda_b^0 \to \Lambda_c(2860)^+ \ell^- \bar{\nu}_\ell$ and $\Lambda_b^0 \to \Lambda_c(2625)^+ \ell^- \bar{\nu}_\ell$. Our predicted branching fraction for $\Lambda_b^0 \to \Lambda_c(2625)^+ \ell^- \bar{\nu}_\ell$ is consistent with experimental data and other theoretical predictions, validating the reliability of our method. On this basis, we also present the branching fraction of $\Lambda_b^0 \to \Lambda_c(2860)^+ \ell^- \bar{\nu}_\ell$. These results may serve as a theoretical reference for future experimental measurements of this decay channel.

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Hui-Hui Duan, Jia-Bao Feng, Feng-Mei Liu, Qin Chang. 2026-05-22. Semileptonic decay of $\Lambda_b^0 \to \Lambda_c (2860)^+/\Lambda_c(2625)^+\ell^-\overline{\nu}_\ell$ within QCD light-cone sum rules. https://arxiv.org/abs/2605.23716

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