Semileptonic ${\mathrm{\Lambda }}_b\to {\bar{\nu }}_{l}l{\mathrm{\Lambda }}_c(2595)$ and ${\mathrm{\Lambda }}_b\to {\bar{\nu }}_{l}l{\mathrm{\Lambda }}_c(2625)$ decays in the molecular picture of ${\mathrm{\Lambda }}_c(2595)$ and ${\mathrm{\Lambda }}_c(2625)$

We evaluate the partial decay widths for the semileptonic $\Lambda_b \to \bar \nu_l l \Lambda_c(2595)$and$\Lambda_b \to \bar \nu_l l \Lambda_c(2625)$decaysfromtheperspectivethatthesetwo$\Lambda^_c$ resonances are dynamically generated from the $DN$ and $D^{\ast }N$ interaction with coupled channels. We find that the ratio of the rates obtained for these two reactions is compatible with present experimental data and is very sensitive to the $D^ N$ coupling, which becomes essential to obtain agreement with experiment. Together with the results obtained for the ${\mathrm{\Lambda }}_b\to {\pi }^{-}{\mathrm{\Lambda }}_c^{\ast }$ reactions, it gives strong support to the molecular picture of the two ${\mathrm{\Lambda }}_c^{\ast }$ resonances and the important role of the $D^{\ast }N$ component neglected in prior studies of the ${\mathrm{\Lambda }}_c(2595)$ from the molecular perspective.