Berlin 2005 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 12: Theorie

HK 12.1: Group Report

Friday, March 4, 2005, 16:30–17:00, TU MA041

Signal of confinement in SU(2) propagators — •Kurt Langfeld, Gunnar Schulze, Wolfgang Lutz, and Hugo Reinhardt — Institute for Theoretical Physics, University of Tuebingen, D-72076 Tuebingen

Recently, a tight relation was established [1] between the Gribov-Zwanziger horizon criterion for confinement and the vortex picture, using the Maximal Center Gauge. On the basis of these findings, we show that the Maximal Center Gauge disentangles the confining degrees of freedom from the gluon and ghost fields; the latter fields appear in Landau gauge. The gluon-, ghost- and center field propagators are studied. It is shown that the ghost form factor is finite in the IR limit while the center fields act as confiners. Finally, the investigation of the low lying eigenmodes of a chirally improved Dirac operator reveals an intimate relation between the center fields and spontaneous chiral symmetry breaking.

[1] Gattnar, Langfeld, Reinhardt, Phys. Rev. Lett. 93, 061601 (2004)