Possible ${\mathrm{\Lambda }}_c{\mathrm{\Lambda }}_c$ molecular bound state

Possible ${\mathrm{\Lambda }}_c{\mathrm{\Lambda }}_c$ hadronic molecule is investigated in the one-pion-exchange potential model. In the study with this model, the heavier meson exchange effects are encoded into a phenomenological cutoff parameter and couplings to the nearby ${\mathrm{\Sigma }}_c{\mathrm{\Sigma }}_c$, ${\mathrm{\Sigma }}_c{\mathrm{\Sigma }}_c^{\ast }$, and ${\mathrm{\Sigma }}_c^{\ast }{\mathrm{\Sigma }}_c^{\ast }$ channels are essential. From the numerical results, we find that a molecular bound state of two ${\mathrm{\Lambda }}_c$’s is possible, where the tensor force plays a crucial role, although the binding energies are sensitive to the cutoff parameter.