Possible $\Lambda_c\Lambda_c$ molecular bound state

Abstract

Possible $\Lambda_c\Lambda_c$ 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 $\Sigma_c\Sigma_c$, $\Sigma_c\Sigma_c^*$, and $\Sigma_c^*\Sigma_c^*$ channels are essential. From the numerical results, we find that a molecular bound state of two $\Lambda_c$'s is possible, where the tensor force plays a crucial role, although the binding energies are sensitive to the cutoff parameter.