Charmonium states in quark-gluon plasma |
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Authors: | Su Houng Lee and Kenji Morita |
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Institution: | (1) Institute of Physics and Applied Physics, Yonsei University, Seoul, 120-749, Korea |
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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/ψ, both of which are larger than 100 MeV at slightly above T
c.
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Keywords: | Quarkonium quark-gluon plasma |
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