  A charmonium produced in heavy ion collisions at RHIC and LHC propagates
through a dense co-moving matter with a rather high relative momentum,
<p_T^2>=4-10GeV^2. In spite of Debye screening of the binding potential, the
charmonium survives with a substantial probability, even if the c-cbar
potential is completely screened in the hot environment. In addition, the
color-exchange interaction with the medium is another important source of
charmonium suppression. Attenuation in a hot medium caused by both effects is
evaluated by means of the path integral technique, which requires ability of
boosting the binding potential to a moving reference frame. This problem is
solved in the approximation of small intrinsic velocities of the charmed
quarks.
