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

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.