Hidden charm mesons in nuclear matter and nuclei

Recent results for the ${\eta }_c$- and $J\mathrm{/}\psi$-nucleus bound state energies for various nuclei are presented. The attractive potentials for the ${\eta }_c$ and $J\mathrm{/}\psi$ mesons in the nuclear medium originate, respectively, from the in-medium enhanced $D{D}^{\ast }$ and $D\bar{D}$ loops in the ${\eta }_c$ and $J\mathrm{/}\psi$ self energies. Our results suggest that the ${\eta }_c$ and $J\mathrm{/}\psi$ mesons should form bound states with all the nuclei considered.