10.1088/1126-6708/2007/09/066
Laine, Mikko
Mikko
Laine0000-0002-2680-4213
Philipsen, Owe
Owe
Philipsen
Tassler, Marcus
Marcus
Tassler
Thermal imaginary part of a real-time static potential from classical lattice gauge theory simulations
INT SCHOOL ADVANCED STUDIES
2007
2010-04-29T13:05:58Z
2018-07-24T12:58:45Z
journal_article
https://pub.uni-bielefeld.de/record/1631848
https://pub.uni-bielefeld.de/record/1631848.json
Recently, a finite-temperature real-time static potential has been introduced via a Schrodinger-type equation satisfied by a certain heavy quarkonium Green's function. Furthermore, it has been pointed out that it possesses an imaginary part, which induces a finite width for the tip of the quarkonium peak in the thermal dilepton production rate. The imaginary part originates from Landau-damping of low-frequency gauge fields, which are essentially classical due to their high occupation number. Here we show how the imaginary part can be measured with classical lattice gauge theory simulations, accounting non-perturbatively for the infrared sector of finite-temperature field theory. We demons trate that a non-vanishing imaginary part indeed exists non-perturbatively; and that its value agrees semi-quantitatively with that predicted by Hard Loop resummed perturbation theory.