Speaker
Mr
Miguel angel ESCOBEDO ESPINOSA
(CEA Saclay-CNRS)
Description
New developments have changed the picture of quarkonium suppression in the last years. On one hand, perturbative and lattice computations indicate that the potential describing the interaction of two heavy quarks in a plasma has an imaginary part that effectively takes into account the collisions of the heavy quarks with the plasma constituents. There are also experimental indications that recombination plays an important role in determining the observed suppression. Both of these developments force us to deepen our understanding of the dynamics of quarkonia in a medium, beyond the static or equilibrium picture that prevails in most discussions. In this talk we investigate the quantum evolution of quarkonium in a thermal medium, including finite momentum effects that are usually ignored in potential models. By treating color degrees of freedom in a rigorous way we are able to understand under which circumstances a classical evolution, similar to that given by a Langevin equation, can be obtained. This classical equation can be generalized to an arbitrary number of heavy quarks, allowing us to study within the same formalism quarkonium suppression and recombination.
Author
Mr
Miguel angel ESCOBEDO ESPINOSA
(CEA Saclay-CNRS)
Co-author
Mr
Jean-Paul Blaizot
(CEA Saclay)
