Abstract
Based on interaction potentials between a heavy quark and antiquark as extracted from recent QCD lattice calculations, we set up a Brueckner-type many-body scheme to study the properties of light (anti-) quarks in a quark-gluon plasma at moderate temperatures, $T\ensuremath{\simeq}$ 1--2 ${T}_{c}$. The quark-antiquark T matrix, including both color-singlet and color-octet channels, and corresponding quark self-energies and spectral functions are calculated self-consistently. The repulsive octet potential induces quasiparticle masses of up to 150 MeV, whereas the attractive color-singlet part generates resonance structures in the $q\text{\ensuremath{-}}\overline{q}$ T matrix, which in turn lead to quasiparticle widths of ~200 MeV. This corresponds to scattering rates of ~1 fm${}^{\ensuremath{-}1}$ and may reflect liquid-like properties of the system.
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