Dr Gábor Balassa (Wigner Research Centre for Physics, Hungarian Academy of Sciences)

Non-equilibrium Charmonium dynamics in heavy-ion collisions

The masses of the low lying charmonium states, shifted downwards due to the second order Stark effect. In pbar Au collisions at 6−10 GeV we study their in-medium propagation.The time evolution of the spectral functions of these charmonium states are studied with a Boltzmann Uehling-Uhlenbeck (BUU) type transport model. The in medium mass shift of these states can be observed in the dilepton spectrum, therefore, by observing the dileptonic decay channel of these low lying charmonium states, especially for PSI(3686), one can gain information about the largeness of the gluon condensate in nuclear matter. The methods used to calculate the elementary cross sections with charmonium in the final states are also discussed.