${\mathrm{\Lambda }}_c(2910)$ and ${\mathrm{\Lambda }}_c(2940)$ as the conventional baryons dressed with the $D^{\ast }N$ channel

In this work, we treat ${\mathrm{\Lambda }}_c(2910{)}^{+}$ and ${\mathrm{\Lambda }}_c(2940{)}^{+}$ as the conventional $udc$ cores dressed with the $D^{\ast }N$ channel. We provide a possible interpretation to both ${\mathrm{\Lambda }}_c(2910{)}^{+}$ and ${\mathrm{\Lambda }}_c(2940{)}^{+}$ within the same framework. In the study, we consider not only the effects between the conventional triquark core and the $D^{\ast }N$ channel but also the $D^{\ast }N$-$D^{\ast }N$ interactions. The mass of ${\mathrm{\Lambda }}_c$ state with $J^P=1\mathrm{/}{2}^{-}$ is larger than that with $J^P=3\mathrm{/}{2}^{-}$ in this unquenched picture, which is very different from the prediction of the conventional quenched quark model. Based on the mass spectrum, the spin-parity of ${\mathrm{\Lambda }}_c(2940{)}^{+}$ is more likely to be $1\mathrm{/}{2}^{-}$ while ${\mathrm{\Lambda }}_c(2910{)}^{+}$ prefers $3\mathrm{/}{2}^{-}$. We look forward to the future experiments can test our results with more precise experimental data.