Eur. Phys. J. C (2025) 85: 1382
https://doi.org/10.1140/epjc/s10052-025-15110-z

Regular Article - Theoretical Physics

Analysis of the semileptonic decays ${\mathrm{\Lambda }}_b\to {\mathrm{\Lambda }}_{c}l{\overline{\nu }}_l$ and ${\mathrm{\Xi }}_b\to {\mathrm{\Xi }}_{c}l{\overline{\nu }}_l$ in QCD sum rules

¹ School of Physics, Southeast University, 210094, Nanjing, People’s Republic of China
² Department of Mathematics and Physics, North China Electric Power University, 071003, Baoding, People’s Republic of China
³ Lanzhou Center for Theoretical Physics, Lanzhou University, 730000, Lanzhou, People’s Republic of China

^a l17693567997@163.com

Received: 22 October 2025
Accepted: 20 November 2025
Published online: 4 December 2025

Abstract

In this article, the electroweak transition form factors of ${\mathrm{\Lambda }}_b\to {\mathrm{\Lambda }}_c$ and ${\mathrm{\Xi }}_b\to {\mathrm{\Xi }}_c$ are analyzed within the framework of three-point QCD sum rules. In phenomenological side, all possible couplings of interpolating current to hadronic states are considered. In QCD side, the perturbative part and the contributions of vacuum condensates up to dimension 8 are also included. With the estimated form factors, we study the decay widths and branching ratios of semileptonic decays ${\mathrm{\Lambda }}_b\to {\mathrm{\Lambda }}_{c}l{\overline{\nu }}_l$ and ${\mathrm{\Xi }}_b\to {\mathrm{\Xi }}_{c}l{\overline{\nu }}_l$ ($l=e,\mu$ and $\tau$). Our results for the branching ratios of ${\mathrm{\Lambda }}_b\to {\mathrm{\Lambda }}_{c}l{\overline{\nu }}_l$ are comparable with experimental data and the results from other collaborations. In addition, our prediction for the branching ratio of ${\mathrm{\Xi }}_b\to {\mathrm{\Xi }}_{c}l{\overline{\nu }}_l$ can provide a valuable reference for future experimental measurements.