On light baryons and their excitations

Abstract

We study ground states and excitations of light octet and decuplet baryons within the framework of Dyson-Schwinger and Faddeev equations. We improve upon similar approaches by explicitly taking into account the momentum-dependent dynamics of the quark-gluon interaction that leads to dynamical chiral symmetry breaking. We perform calculations in both the three-body Faddeev framework and the quark-diquark approximation in order to assess the impact of the latter on the spectrum. Our results indicate that both approaches agree well with each other. The resulting spectra furthermore agree one-to-one with experiment, provided well-known deficiencies of the rainbow-ladder approximation are compensated for. We also discuss the mass evolution of the Roper and the excited Delta with varying pion mass and analyse the internal structure in terms of their partial wave decompositions.

12 pages, 7 figures

References in corpus (19)

• Infrared Properties of QCD from Dyson-Schwinger equations
• Baryons as relativistic three-quark bound states
• Sketching the Bethe-Salpeter kernel
• Light hadron spectroscopy using domain wall valence quarks on an Asqtad sea
• Analytic properties of the scattering amplitude and resonances parameters in a meson exchange model
• Baryon spectrum with $N_f=2+1+1$ twisted mass fermions
• Chiral dynamics of the S11(1535) and S11(1650) resonances revisited
• Nucleon electromagnetic form factors from the covariant Faddeev equation
• Masses of ground and excited-state hadrons
• New results on the Roper resonance and the P_{11} partial wave
• Spectra of heavy quarkonia in a Bethe-Salpeter-equation approach
• Spectra of heavy mesons in the Bethe-Salpeter approach
• Hadron Spectroscopy with Dynamical Chirally Improved Fermions
• Further evidence for N(1900)P_{13} from photoproduction of hyperons
• Mass spectra and Regge trajectories of light mesons in the Bethe-Salpeter approach
• A novel analysis method for excited states in lattice QCD - the nucleon case
• Octet and Decuplet masses: a covariant three-body Faddeev calculation
• Delta-baryon mass in a covariant Faddeev approach
• Diquark bound states with a completely crossed ladder truncation

Cited by in corpus (8)

• Baryons as relativistic three-quark bound states
• Spectrum of light- and heavy-baryons
• Locating the critical endpoint of QCD: mesonic backcoupling effects
• Empirical Consequences of Emergent Mass
• Light Baryon Spectroscopy
• The $\sigma$-meson: four-quark vs. two-quark components and decay width in a Bethe-Salpeter approach
• More about the light baryon spectrum
• Regge trajectories of Excited Baryons, quark-diquark models and quark-hadron duality