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      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/072/01/0097-0108

    • Keywords

       

      Quarkonium; quark-gluon plasma.

    • Abstract

       

      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 $T_{c}$.

    • Author Affiliations

       

      Su Houng Lee1 Kenji Morita1

      1. Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749, Korea
    • Dates

       
  • Pramana – Journal of Physics | News

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