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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…
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-…
The effect of an infrared divergent quark-antiquark interaction kernel on other Green functions
Reinhard Alkofer, Mario Mitter
The n-point Green functions of Landau gauge QCD are systematically investigated in a Dyson-Schwinger approach assuming a static linearly rising potential between fundamental color…
Center Phase Transition from Fundamentally Charged Matter Propagators
Mario Mitter, Markus Hopfer, Bernd-Jochen Schaefer +1
The center phase transition at non-vanishing temperatures is investigated in Landau gauge Quantum Chromodynamics (QCD) and scalar QCD. For each theory novel order parameters for th…
The Quark-Gluon Vertex in Landau gauge QCD
Markus Hopfer, Andreas Windisch, Reinhard Alkofer
The coupled system of the quark-gluon vertex and quark propagator Dyson-Schwinger equations (DSEs) is investigated within Landau gauge QCD. The aim is to get a deeper insight into…
On the Analytic Structure of Scalar Glueball Operators
Andreas Windisch, Markus Q. Huber, Reinhard Alkofer
The correlator of the square of the Yang-Mills field-strength tensor corresponds to a scalar glueball, i.e., to a bound-state formed by gluonic ingredients only. It has quantum num…