München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 47: Hadron Structure and Spectroscopy VII

HK 47.1: Group Report

Thursday, March 21, 2019, 14:00–14:30, HS 13

Baryons as relativistic three-quark bound states — •Reinhard Alkofer — Institut für Physik, Universität Graz

The spectrum and electromagnetic properties of baryons described as relativistic three-quark bound states within QCD are described. The composite nature of baryons results in a rich excitation spectrum, whilst leading to highly non-trivial structural properties explored by the coupling to external (electromagnetic and other) currents. Both present many unsolved problems despite decades of experimental and theoretical research. In this talk I will discuss the progress in these fields from a theoretical perspective, focusing on non-perturbative QCD as encoded in the functional approach via Dyson-Schwinger and Bethe-Salpeter equations. Recent results on the spectrum of non-strange and strange baryons, their elastic and transition form factors as well as the issues of two-photon processes and Compton scattering determined in the Dyson-Schwinger framework are confronted with those of lattice QCD and the available experimental data. The general aim is to identify the underlying physical mechanisms behind the plethora of observable phenomena in terms of the underlying quark and gluon degrees of freedom.