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HK: Fachverband Physik der Hadronen und Kerne
HK 1: Hadronenstruktur und -spektroskopie
HK 1.7: Talk
Monday, March 19, 2012, 15:45–16:00, RW 1
Analytic Structure of Ghosts and Gluons from DSEs in Laudau Gauge — •Stefan Strauss1, Christian Fischer1, and Christian Kellermann2 — 1Institut für theoretische Physik, JLU Gießen, Gießen, Germany — 2Institut für Kernphysik, TU Darmstadt, Darmstadt, Germany
We report on results for the analytic structure of the Landau gauge ghost and gluon propagators in the complex momentum plane. The hierarchy of Dyson-Schwinger equations is truncated in such a way that the propagators are in good agreement with lattice results at real spacelike Euclidean momenta. In contrast to expectations from Gribov-Zwanziger-like effective theories our results indicate the absence of pole singularities in the complex part of the momentum plane. Additionally, both propagators show branch cut singularities for real timelike momenta and are positivity violating.