Speaker
Description
The masses of the low lying charmonium states, namely, the $J/\Psi$,
$\Psi(3686)$, and $\Psi(3770)$ are shifted downwards due to the
second order Stark effect. In $\bar p + \text{Au}$ collisions at
$6-10$~GeV we study their in\,-\,medium propagation. The time
evolution of the spectral functions of these charmonium states is
studied with a Boltzmann\,-\,Uehling\,-\,Uhlenbeck (BUU) type
transport model. We show that their in\,-\,medium mass shift can be
observed in the dilepton spectrum. Therefore, by observing the
dileptonic decay channel of these low lying charmonium states,
especially for $\Psi(3686)$, we can gain information about the
magnitude of the gluon condensate in nuclear matter. This
measurement could be performed at the upcoming PANDA experiment at
FAIR.
