from 31 May 2021 to 4 June 2021
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Charmonium in nuclear matter and nuclei



Primary authors


Results for the $\eta_c$- and $J/\Psi$-nucleus bound state energies for various nuclei are presented. These results are obtained using effective Lagrangians at the hadronic level. Essential input for the calculation, namely the medium-modified $D$ and $D^{*}$ meson masses, as well as the density distributions in nuclei, are calculated within the quark-meson coupling model. The attractive potentials for the $\eta_c$ and $J/\Psi$ mesons in the nuclear medium originate, respectively, from the in-medium enhanced $DD^{*}$ and $D\bar{D}$ loops in the $\eta_c$ and $J/\Psi$ self energies. Our results suggest that the $\eta_c$ and $J/\Psi$ mesons should form bound states with all the nuclei considered. Some of the results presented were recently published in J.J. Cobos-Martinez et al, Phys. Lett. B 811 (2020) 135882