Speaker
Mr
Philipp Gubler
(Tokyo Institute of Technology)
Description
Charmonium spectral functions at finite temperature are investigated, using QCD sum rules in combination with the maximum entropy method. This approach makes it possible to directly obtain the spectral function from the sum rules, without having to introduce any specific assumption about its functional form. QCD sum rules incorporate finite temperature effects by the change of the various gluonic condensates that appear in the operator product expansion. These changes depend on the energy density and pressure at finite temperature, which we extract from lattice QCD. We find that while J/psi and eta_c manifest themselves as clear peaks in the spectral function below the deconfinement temperature T_c, they dissolve into the continuum already at temperatures between 1.0 T_c and 1.1 T_c.
Primary author
Mr
Philipp Gubler
(Tokyo Institute of Technology)
Co-authors
Dr
Kenji Morita
(Yukawa Institute for Theoretical Physics)
Prof.
Makoto Oka
(Tokyo Institute of Technology)
