Münster 2017 – wissenschaftliches Programm
HK 55.3: Hauptvortrag
Freitag, 31. März 2017, 09:50–10:30, F 1
Baryons as bound states of quarks — •Gernot Eichmann — Justus-Liebig-Universität Giessen
Hadrons are bound states of the strong interaction, with mesons as quark-antiquark states and baryons made of three valence quarks. Since most of what we know about the quarks and gluons inside hadrons comes from our knowledge of the nucleon, a combined understanding of the nucleon and its resonances within Quantum Chromodynamics (QCD) is a major goal in studying the strong interaction. In the past years much progress has been made in the description of hadrons from first principles using functional methods. The basic ingredients are QCD's n-point functions which are solved self-consistently and enter in the subsequent calculation of hadron masses, form factors and scattering amplitudes. This allows for a combined description of baryons, light and heavy mesons, tetraquarks and other observables from the same underlying building blocks.
In this talk I will focus on baryons and review recent results for the light baryon spectrum, obtained from solving the genuine three-body equation as well as its quark-diquark simplification. Both approaches yield similar results, which underlines the role of diquark correlations within baryons. The resulting baryons carry a rich structure with relativistically induced orbital angular momentum that would be forbidden in the non-relativistic quark model. I will conclude with a brief survey of other recent applications, including meson and baryon form factors, the light scalar mesons as tetraquarks, and the muon anomalous magnetic moment.