Abstract

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Wilson loop in classical lattice gauge theory and the thermal width of heavy quarkonium

Presenter: Marcus Tassler — University of Muenster

M. Laine, O. Philipsen, P. Romatschke, M. Tassler

We present an estimate for the imaginary part of the recently introduced real-time static potential. It can be extracted from the time evolution of the Wilson loop in classical lattice gauge theory. The real-time static potential determines, through a Schroedinger-type equation and a subsequent Fourier-transform of its solution, the spectral function of heavy quarkonium in finite-temperature QCD. We also compare the results of the classical simulations with those of Hard-Thermal-Loop-improved simulations, as well as with analytic expectations based on resummed perturbation theory.