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Descrição
It was shown in a certain approximation that dissociation of heavy quark
bound states in a quark-gluon plasma occurs due to the emergence of
an imaginary part of the potential. We check the robustness of this
prediction against corrections. We calculate higher order corrections to
the potential in a systematic and rigourous way, in the region where
bound states dissociate. This region is dominated by what we call the
semi-hard scale, which is smaller than the temperature and larger than
the screening mass in natural units. We use a triple expansion in terms
of the coupling constant, the semi-hard scale over the temperature, and
the screening mass over the semi-hard scale. We have used our result
for the beyond leading order potential to calculate the dissociation
temperature, and confirmed the validity of the picture that was proposed
from the leading order approximation. We compare our results with
lattice data.