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Effective mass signatures in multiphoton pair production
Christian Kohlfürst, Holger Gies, Reinhard Alkofer
Electron-positron pair production in oscillating electric fields is investigated in the nonperturbative threshold regime. Accurate numerical solutions of quantum kinetic theory for…
Infrared Saturation and Phases of Gauge Theories with BRST Symmetry
Valentin Mader, Martin Schaden, Daniel Zwanziger +1
We investigate the infrared limit of the quantum equation of motion of the gauge boson propagator in various gauges and models with a BRST symmetry. We find that the saturation of…
On the Landau gauge matter-gluon vertex in scalar QCD in a functional approach
Markus Hopfer, Reinhard Alkofer
Recently the quark-gluon vertex has been investigated in Landau gauge using a combined Dyson-Schwinger and nPI effective action approach. We present here a numerical analysis of a…
How to determine the branch points of correlation functions in Euclidean space
Andreas Windisch, Markus Q. Huber, Reinhard Alkofer
Two-point correlators represented by either perturbative or non-perturbative integral equations in Euclidean space are considered. In general, it is difficult to determine the anal…
Delta and Omega electromagnetic form factors in a three-body covariant Bethe-Salpeter approach
Helios Sanchis-Alepuz, Richard Williams, Reinhard Alkofer
The electromagnetic form factors of the Delta and Omega baryons are calculated in the framework of Poincare-covariant bound-state equations. The quark-quark interaction is truncate…
Delta and Omega electromagnetic form factors in a covariant three-body approach
Helios Sanchis-Alepuz, Richard Williams, Reinhard Alkofer
We study baryons as three-body systems using the QCD degrees of freedom in the framework of covariant Bethe-Salpeter equations. The interaction among quarks is reduced to a vector-…