Heavy quarkonium dissociation at finite temperature with effective field theories

Abstract

The dissociation of heavy quarkonium seen in heavy-ion collisions is a phenomena that allows to extract information of the produced thermal medium. This was believed to be due to the screening of the static potential, but recently perturbative computations and some lattice studies have pointed out to the possibility of having an imaginary part of the potential that would also contribute to dissociation. In recent years a program to study heavy quarkonium with the use of non-relativistic effective field theories has been started, this allows to make the computations in a more systematic way by defining a more suitable power counting and making it more difficult to miss necessary resummations. With these techniques the picture of the imaginary potential has been confirmed and a complete study from very low temperatures up to dissociation has been performed for the perturbative case, finding the different energy shifts and decay widths for the different temperature regimes. In these proceedings a review of these results will be given, with special focus on the more recent developments, as the connection between the imaginary part and the cross-section used in phenomenological models and the effect of having a finite velocity between the medium and the heavy quarkonium.