Survival of Charmonia above T_c in Anisotropic Lattice QCD(CGC/Lattice QCD/etc.,New Frontiers in QCD 2008-Fundamental Problems in Hot and/or Dense Matter-)

概要

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We find a strong evidence for the survival of J/Ψ and η_c as spatially-localized cc^^-(quasi-) bound states above the QCD critical temperature T_c, by investigating the boundary-condition dependence of their energies and spectral functions. In a finite-volume box, there arises a boundary-condition dependence for spatially spread states, while no such dependence appears for s patially compact states. In lattice QCD, we find almost no spatial boundary-condition dependence for the energy of the cc system in J/Ψ and η_c channels for T∼(1.11-2.07) T_c.We also investigate the spectral function of charmonia above T_c lattice QCD using the maximum entropy method (MEM) in terms of the boundary-condition dependence. There is no spatial boundary-condition dependence for the low-lying peaks corresponding to J/Ψ and η_c around 3GeV at 1.62T_c. These facts indicate the survival of J/Ψ and η_c as compact cc^^-(quasi-) bound states for T_c<T<2T_c.
理論物理学刊行会の論文
2008-10-15