#### Filter Results:

#### Publication Year

2001

2011

#### Publication Type

#### Co-author

#### Publication Venue

Learn More

- M S Bhagwat, A Höll, A Krassnigg, C D Roberts
- 2006

This Dyson-Schwinger equation (DSE) aperçu highlights recent applications to mesons. It reports features of, and results for, pseudoscalar and scalar bound-state residues in vacuum polarisations, and exhibits how a restoration of chiral symmetry in meson tra-jectories could be manifest in a relationship between them. It also touches on nucleon studies,… (More)

- I C Cloët, A Krassnigg, C D Roberts
- 2008

We provide a snapshot of Dyson-Schwinger equation applications to the theory and phenomenology of hadrons. Exact results for pseudoscalar mesons are highlighted, with details relating to the U A (1) problem. Calculated masses of the lightest J = 0, 1 states are discussed. We recapitulate upon studies of nucleon properties and give a perspective on the… (More)

- J C R Bloch, A Krassnigg, C D Roberts
- 2003

The proton's elastic electromagnetic form factors are calculated using an Ansatz for the nucleon's Poincaré covariant Faddeev amplitude that only retains scalar diquark correlations. A spectator approximation is employed for the current. On the domain of q 2 accessible in modern precision experiments these form factors are a sensitive probe of… (More)

- A Höll, A Krassnigg, C D Roberts
- 2008

An hallmark of present-day Dyson-Schwinger equation applications in hadron physics is the existence of a systematic and symmetry preserving truncation scheme. This enables the proof of exact results; e.g., the leptonic decay constant of every pseudoscalar meson except the pion vanishes in the chiral limit. Calculations using the scheme's leading-order… (More)

- A Krassnigg, C D Roberts
- 2003

Dyson-Schwinger equations furnish a Poincaré covariant approach to hadron physics. They reveal that dynamical chiral symmetry breaking is tied to the long-range behaviour of the strong interaction and make predictions corroborated by modern lattice-QCD simulations. A hallmark in the contemporary use of DSEs is the existence of a nonperturbative, symmetry… (More)

We recapitulate on aspects of Dyson-Schwinger equation studies relevant to pseu-doscalar mesons: lattice confirmation of the DSE prediction that propagators are nonperturbatively dressed in the infrared; and exact results, e.g., in the chiral limit the leptonic decay constant vanishes for every pseudoscalar meson except the pion. The vast body of pion data… (More)

- R Alkofer, A Höll, M Kloker, A Krassnigg, C D Roberts
- 2008

A Poincaré covariant Faddeev equation, which describes baryons as composites of confined-quarks and-nonpointlike-diquarks, is solved to obtain masses and Faddeev amplitudes for the nucleon and ∆. The amplitudes are a component of a nucleon-photon vertex that automatically fulfills the Ward-Takahashi identity for on-shell nucleons. These elements are… (More)

- A Höll, A Krassnigg, C D Roberts
- 2004

Aspects of the dressed-quark-gluon vertex and their role in the gap and Bethe-Salpeter equations are briefly surveyed using an intuitive model. The model allows one to elucidate why a linear extrapolation to the chiral limit of extant lattice data on the dressed-quark mass-function overestimates this function and hence the value of the vacuum quark… (More)

- D Nicmorus, G Eichmann, A Krassnigg, R Alkofer
- 2008

We present a calculation of the three-quark core contribution to the mass of the ∆-resonance in a Poincaré-covariant Faddeev framework. A consistent setup for the dressed-quark propagator, the quark-quark and quark-'diquark' interactions is used, where all the ingredients are solutions of their respective Dyson-Schwinger or Bethe-Salpeter equations in… (More)