We investigate possible mass shift and width broadening of J/ψ in hot gluonic matter using QCD sum rules. Input values of gluon condensates at finite temperature are extracted from lattice QCD data for the energy density and pressure. Although stability of the moment ratio is achieved only up to T/Tc 1.05, the gluon condensates cause a decrease of the moment ratio, which results in a change of the spectral properties. Using the Breit-Wigner form for the phenomenological side, we find that the mass shift of J/ψ just above Tc can reach maximally 200 MeV and the width can broaden to dozens of MeV.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)