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The Gluon Propagator at High Temperature: Screening, Improvement and Non-Zero Momenta
U. M. Heller, F. Karsch, J. Rank
We study the gluon propagator and the singlet potential in Landau gauge in the deconfined phase of SU(2) lattice gauge theory, using both the standard Wilson action and a tree-leve…
Staggered Fermion Actions with Improved Rotational Invariance
B. Beinlich, A. Bicker, F. Karsch +2
We introduce a class of improved actions for staggered fermions which to O(p^4) and O(p^6), respectively, lead to rotationally invariant propagators. We discuss the resulting reduc…
Finite Temperature Phase Diagramm of QCD with improved Wilson fermions
F. Karsch, E. Laermann, M. Oevers +1
We present first results of a study of two flavour QCD with Wilson fermions at finite temperature. We have used tree level Symanzik improvement in both the gauge and fermion part o…
Screening Masses and Improvement in Pure SU(2) Lattice Gauge Theory at High Temperatures
U. M. Heller, F. Karsch, J. Rank
From the long-distance behaviour of gluon and Polyakov loop correlation functions we extract masses resp. energies in the electric and magnetic sectors. We discuss their dependence…
Direct determination of the gauge coupling derivatives for the energy density in lattice QCD
F. Karsch, J. Engels, T. Scheideler
By matching Wilson loop ratios on anisotropic lattices we measure the coefficients $\cs$ and $\ct$, which are required for the calculation of the energy density. The results are co…
Screening Lengths in SU(2) Gauge Theory at Finite Temperature
U. M. Heller, F. Karsch, J. Rank
We discuss the calculation of electric and magnetic screening masses in SU(2) gauge theory. The temperature dependence of these masses obtained from the long-distance behaviour of…
On QCD Thermodynamics with Improved Actions
Frithjof Karsch
We discuss recent advances in the calculation of thermodynamic observables using improved actions. In particular, we discuss the calculation of the equation of state of the SU(3) g…
String Tension and Thermodynamics with Tree Level and Tadpole Improved Actions
B. Beinlich, F. Karsch, E. Laermann +1
We calculate the string tension, deconfinement transition temperature and bulk thermodynamic quantities of the SU(3) gauge theory using tree level and tadpole improved actions. Fin…
Screened Perturbation Theory
Frithjof Karsch, Andras Patkos, Peter Petreczky
A new perturbative scheme is proposed for the evaluation of the free energy density of field theories at finite temperature. The screened loop expansion takes into account exactly…