J/Psi mass shift in nuclear matter

TL;DR

This paper calculates the mass shift of the J/Psi particle in nuclear matter using an effective Lagrangian approach, considering meson loop contributions and medium modifications, with implications for bound state formation.

Contribution

It introduces a detailed calculation of J/Psi mass shift in nuclear matter incorporating medium-modified meson masses and loop regularization, providing new quantitative estimates.

Findings

J/Psi mass shift ranges from -16 to -24 MeV at normal nuclear density.

Mass shift is sensitive to the cutoff parameters in the form factors.

Results suggest possible formation of J/Psi-nucleus bound states.

Abstract

The $J/\Psi$ mass shift in cold nuclear matter is computed using an effective Lagrangian approach. The mass shift is computed by evaluating $D$ and $D^*$ meson loop contributions to the $J/\Psi$ self-energy employing medium-modified meson masses. The modification of the $D$ and $D^*$ masses in nuclear matter is obtained using the quark-meson coupling model. The loop integrals are regularized with dipole form factors and the sensitivity of the results to the values of form-factor cutoff masses is investigated. The $J/\Psi$ mass shift arising from the modification of the $D$ and $D^*$ loops at normal nuclear matter density is found to range from -16 MeV to -24 MeV under a wide variation of values of the cutoff masses. Experimental perspectives for the formation of a bound state of $J/\Psi$ to a nucleus are investigated.