A. Krassnigg

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A strongly momentum-dependent dressed-quark mass function is basic to QCD. It is central to the appearance of a constituent-quark mass-scale and an existential prerequisite for Goldstone modes. Dyson-Schwinger equation (DSEs) studies have long emphasised this importance, and have proved that QCD’s Goldstone modes are the only pseudoscalar mesons to possess(More)
Diphenylmethyleneaminooxycarboxylic acids were found to represent novel type inhibitors of the enzyme aldose reductase. Ester derivatives of the most active compound (3c) (IC(50)=33 microM) were prepared as potential prodrugs and the rate of degradation was studied by treatment with buffers, plasma, and various hydrolytic enzymes. Whereas all compounds were(More)
Electron scattering at large Q probes a nucleon’s quark core. This core’s contribution to electromagnetic form factors may be calculated using Poincaré covariant Faddeev amplitudes combined with a nucleon-photon vertex that automatically fulfills a WardTakahashi identity for on-shell nucleons. The calculated behaviour of GpE(Q )/GpM(Q ) on Q ∈ [2, 6]GeV(More)
and refer to [2] and [3] for more background information. Here, M is the wanted eigenvalue of the invariant mass squared operator, with associated eigenfunction ψ ≡ Ψqq̄. It is the probability amplitude for finding in the qq̄–space a quark with the effective (constituent) mass m1, longitudinal momentum fraction x, transversal momentum ~k⊥ and helicity λ1,(More)
Phenomenological consequences of the infrared singular, instantaneous part of the gluon propagator in the Coulomb gauge are investigated. 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(More)