Heavy quarkonium correlators at finite temperature: QCD sum rule approach

Understand

We investigate the properties of heavy quarkonia at finite temperature in detail using QCD sum rules.

• Extending previous analyses, we take into account a temperature dependent effective continuum threshold and derive constraints on the mass, the width, and the varying effective continuum threshold.
• We find that at least one of these quantities of a charmonium changes abruptly in the vicinity of the phase transition.
• We also calculate the ratio of the imaginary time correlator to its reconstructed one, $G/G_{\text{rec}}$, by constructing a model spectral function and compare it to the corresponding lattice QCD results.