Quarkonia and QGP (September Post, 2014)

If a J/ψ particle(a c-cbar bound state) is placed in QGP, the colour charge of the charm quark "c" will get screened by the quarks, anti-quarks and the gluons of the plasma. The charmonium production was discussed as an important probe of plasma , along with the suggestion by Matsui and Satz which affirmed that with increasing centrality in heavy-ion collisions a suppression of the J/ψ is expected. The dissociation of the charmonium bound-state in a dense medium is connected with the Debye screening of the binding potential. This is influenced by a de-confinement of color charges and thus intimately connected to the formation of  QGP. 

Link to Document (here)