• Su Houng Lee

      Articles written in Pramana – Journal of Physics

    • Charmonium states in quark-gluon plasma

      Su Houng Lee Kenji Morita

      More Details Abstract Fulltext PDF

      We discuss how the spectral changes of quarkonia at $T_{c}$ can reflect the `critical' behaviour of QCD phase transition. Starting from the temperature dependencies of the energy density and pressure from lattice QCD calculation, we extract the temperature dependencies of the scalar and spin-2 gluon condensates near $T_{c}$ . We also parametrize these changes into the electric and magnetic condensate near $T_{c}$. While the magnetic condensate hardly changes across $T_{c}$, we find that the electric condensate increases abruptly above $T_{c}$. Similar abrupt change is also seen in the scalar condensate. Using the QCD second-order Stark effect and QCD sum rules, we show that these sudden changes induce equally abrupt changes in the mass and width of $J/\psi$, both of which are larger than 100 MeV at slightly above $T_{c}$.

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