J/Ψ mass shift in nuclear matter

Abstract

The J /Ψ 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/Ψ 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 /Ψ 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/Ψ to a nucleus are investigated.