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Phys Rev Lett. 2015 Feb 27;114(8):082001. Epub 2015 Feb 23.

Static quark-antiquark potential in the quark-gluon plasma from lattice QCD.

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Institute of Theoretical Physics, EPFL, CH-1015 Lausanne, Switzerland.
Fakultät für Physik, Universität Bielefeld, D-33615 Bielefeld, Germany.
Institute for Theoretical Physics, Universität Heidelberg, Philosophenweg 12, D-69120 Heidelberg, Germany.


We present a state-of-the-art determination of the complex valued static quark-antiquark potential at phenomenologically relevant temperatures around the deconfinement phase transition. Its values are obtained from nonperturbative lattice QCD simulations using spectral functions extracted via a novel Bayesian inference prescription. We find that the real part, both in a gluonic medium, as well as in realistic QCD with light u, d, and s quarks, lies close to the color singlet free energies in Coulomb gauge and shows Debye screening above the (pseudo)critical temperature T_{c}. The imaginary part is estimated in the gluonic medium, where we find that it is of the same order of magnitude as in hard-thermal loop resummed perturbation theory in the deconfined phase.

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