Semileptonic decay of $Λ_b^0 \to Λ_c (2860)^+/Λ_c(2625)^+\ell^-\overlineν_\ell$ within QCD light-cone sum rules

Abstract

In this work, we calculate the transition form factors for the weak decays $Λ_b^0 \to Λ_c(2860)^+$ and $Λ_b^0 \to Λ_c(2625)^+$ using QCD light-cone sum rules, and compute the branching fractions of the corresponding semileptonic decays $Λ_b^0 \to Λ_c(2860)^+ \ell^- \barν_\ell$ and $Λ_b^0 \to Λ_c(2625)^+ \ell^- \barν_\ell$. Our predicted branching fraction for $Λ_b^0 \to Λ_c(2625)^+ \ell^- \barν_\ell$ 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 $Λ_b^0 \to Λ_c(2860)^+ \ell^- \barν_\ell$. These results may serve as a theoretical reference for future experimental measurements of this decay channel.