# Bonn 2010 – wissenschaftliches Programm

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# T: Fachverband Teilchenphysik

## T 13: QCD (Theorie) IV / Quantenfeldtheorie II

### T 13.4: Gruppenbericht

### Donnerstag, 18. März 2010, 17:35–17:55, HG XVI

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

QCD at high temperature T exhibits three different momentum scales T,gT and g^{2}T. 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 g^{2}T 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 g^{2}T scale.

I will discuss the O(g^{6}) contribution to the electric screening mass mE^{2} and O(g^{8}) correction to the effective gauge coupling gE^{2} appearing as matching coefficients in so-called EQCD, which acts as a large-distance effective theory for the theory of strong interactions at finite-temperature.

These corrections are necessary for the pressure of hot QCD at g^{7}. On the other hand, the effective gauge coupling can be used to determine the so-called spatial string tension.