Excited light baryons from quark-gluon-level calculations

Abstract

The task of mapping and explaining the spectrum of baryons and the structure of these states in terms of quarks and gluons is a longstanding challenge in hadron physics, which is likely to persist for another decade or more. We review the progress made in this topic using a functional method based on Dyson-Schwinger equations. This framework provides a non-perturbative, Poincaré-covariant continuum formulation of Quantum Chromodynamics which is able to extract novel insight on baryon properties since the physics at the hadron level is directly related with the underlying quark-gluon substructure, via convolution of Green functions.

arXiv comment9 pages, 4 figures; contribution to the proceedings of the XVIII International Conference on Hadron Spectroscopy and Structure, HADRON-2019. August 16-21, Guilin, China

References in corpus (24)

• Dyson-Schwinger Equations and the Application to Hadronic Physics
• The Infrared Behavior of QCD Green's Functions - Confinement, Dynamical Symmetry Breaking, and Hadrons as Relativistic Bound States
• Lattice gluodynamics computation of Landau-gauge Green's functions in the deep infrared
• Baryons as relativistic three-quark bound states
• Constraints on the IR behavior of the gluon propagator in Yang-Mills theories
• Analysis of a quenched lattice-QCD dressed-quark propagator
• Scaling behavior and positivity violation of the gluon propagator in full QCD
• Process-independent strong running coupling
• Landau-gauge propagators in Yang-Mills theories at beta = 0: massive solution versus conformal scaling
• The three-gluon vertex in Landau gauge
• Nucleon and $\Delta$ elastic and transition form factors
• Octet and Decuplet Baryons in a Covariant and Confining Diquark-Quark Model
• Completing the picture of the Roper resonance
• Pion Generalized Parton Distributions with covariant and Light-front constituent quark models
• Masses of ground-state mesons and baryons, including those with heavy quarks
• The strong running coupling from the gauge sector of Domain Wall lattice QCD with physical quark masses
• Modelling the quark propagator
• Four-point functions and the permutation group S4
• Understanding the nucleon as a Borromean bound-state
• Nucleon-to-Roper electromagnetic transition form factors at large-$Q^2$
• Non-Abelian Ball-Chiu vertex for arbitrary Euclidean momenta
• Parity partners in the baryon resonance spectrum
• Dissecting nucleon transition electromagnetic form factors
• Unraveling the organization of the QCD tapestry