München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 43: Theorie

HK 43.2: Gruppenbericht

Donnerstag, 23. März 2006, 14:30–15:00, G

Aspects of the confinement mechanism in Coulomb-gauge QCD — •Reinhard Alkofer, Markus Kloker, Andreas Krassnigg, Klaus Lichtenegger, and Robert F. Wagenbrunn — Institut für Physik, University of Graz, A-8010 Graz, Austria

Phenomenological consequences of the infrared singular, instantaneous part of the gluon propagator in Coulomb gauge are investigated [1]. The corresponding quark Dyson-Schwinger equation is solved, neglecting retardation and transverse gluons and regulating the resulting infrared singularities. While the quark propagator vanishes as the infrared regulator goes to zero, the frequency integral over the quark propagator stays finite and well-defined. Solutions of the homogeneous Bethe-Salpeter equation for the pseudoscalar and vector mesons as well as for scalar and axial-vector diquarks are obtained. In the limit of a vanishing infrared regulator the diquark masses diverge, while meson properties and diquark radii remain finite and well-defined. These features are interpreted with respect to the resulting aspects of confinement for colored quark-quark correlations. The qualitative features are stable when including transverse gluons. Corresponding preliminary results are presented.

[1] R. Alkofer, M. Kloker, A. Krassnigg, R.F. Wagenbrunn, Phys. Rev. Lett., in print [arXiv:hep-ph/0510028].