Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-05-10
Phys.Rev. C72 (2005) 064905
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages; minor revisions, figures improved and one added, updated references and three added
Scientific paper
10.1103/PhysRevC.72.064905
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, $T\simeq$ 1-2 $T_c$. The quark-antiquark $T$-matrix, including both color-singlet and -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 $q$-$\bar q$ $T$-matrix, which in turn lead to quasiparticle widths of $\sim$200 MeV. This corresponds to scattering rates of $\sim$1 fm$^{-1}$ and may reflect liquid-like properties of the system.
Mannarelli Massimo
Rapp Ralf
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