Pseudo)scalar charmonium in finite temperature QCD

The hadronic parameters of pseudoscalar (�c) and scalar (�c) charmonium are determined at finite temperature from Hilbert moment QCD sum rules. These parameters are the hadron mass, leptonic decay constant, total width, and continuum threshold (s0). The latter is the integration radius of the sum rules in the complex energy (squared) s-plane, corresponding to the threshold energy for the onset of perturbative QCD. Results for s0(T) in both channels confirm predictions from light-light, heavy-light, and heavy-heavy (J/ ) quark systems, i.e. s0(T) decreases monotonically with increasing T until it reaches the QCD threshold, sth = 4m 2 , at a critical temperature T = Tc ' 260 MeV, interpreted as the deconfinement temperature. The driving dynamical mechanism in the (pseudo)scalar channel is solely the temperature dependent gluon � �