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T: Fachverband Teilchenphysik

T 12: QCD (Theorie) / Quantenfeldtheorie

T 12.2: Group Report

Friday, April 1, 2011, 14:15–14:35, 30.23: 10-1

Dimensionally reduced QCD at high temperature — •Jan Möller — Universität Bielefeld, Bielefeld, Deutschland

QCD at high temperature T exhibits three different momentum scales T,gT and g²T. Pertubation theory restricted to the momentum scale T can be treated with conventional methods. But at higher order in pertubation theory, the other scales enter the stage and can contribute to obervables.In contrast to the momentum scale T, these low momentum scales are only accessible through improved analytic methods or non-perturbatively via lattice simulations, as is especially the case for the g²T scale.

At high temperature these momentum scales are clearly separated and allow to construct a sequence of two effective field theories by integrating out the gT and g²T scale.

I will discuss recent progress in this framework in determining the different matching coefficients and point out the difficulties.