Properties of Quarkonia at T_c

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 parameterize 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.

8 pages, Plenary talk given at Quark Matter 2008, Jaipur India

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Cited by in corpus (2)

• Properties of $J/\psi$ at $T_c$: QCD second-order Stark effect
• $X(3872)$ and $T_{cc}$: structures and productions in heavy ion collisions