Study of charmoium dissociation temperatures in finite temperature lattice QCD

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Dissociation temperatures of J/psi, psi', and chi_c states play key roles in the sequential J/psi suppression scenario for high energy heavy ion collisions. We study charmonium dissociation temperatures in quenched lattice QCD. We then extract ground and first exited state masses by diagonalizing correlation functions among different source and sink operators. To distinguish bound states from scattering states, we first compare the charmonium mass spectra under different spatial boundary conditions, and examine the shape and the volume-dependence of their Bethe-Salpeter wave functions. From these studies, we found so far no sign of scattering states up to about 2Tc.