$ \Lambda_c $ semileptonic decays

Motivated by the recent experimental progress in the $\Lambda_c$ decay that contains a neutron in the final state, we analyze the semileptonic decay $\Lambda_c \rightarrow n \ell \nu_\ell$ in the framework of QCD sum rules. The transition form factors are analytically computed using three-point correlation functions and the Cutkosky cutting rules, which can be extrapolated into the physical region by employing the $z$-series parametrization. The branching fractions of $\Lambda_c \rightarrow n e^+ \nu_e$ and $\Lambda_c \rightarrow n \mu^+ \nu_{\mu}$ are estimated to be $(0.281\pm 0.056)\%$ and $(0.275\pm 0.055)\%$, respectively. Furthermore, we calculate as well the relevant decay asymmetry observables sensitive to new physics beyond the standard model. The numerical results of semileptonic decays $\Lambda_c \rightarrow \Lambda \ell \nu_\ell$ are also given and confronted to the latest experimental data.