期刊
PROGRESS IN PARTICLE AND NUCLEAR PHYSICS
卷 91, 期 -, 页码 1-100出版社
ELSEVIER
DOI: 10.1016/j.ppnp.2016.07.001
关键词
Baryon properties; Nucleon resonances; Form factors; Compton scattering; Dyson-Schwinger approach; Bethe-Salpeter/Faddeev equations
资金
- Austrian Science Fund (FWF) [J3392-N20]
- Helmholtz International Center for FAIR within the LOEWE program of the State of Hesse
- BMBF project [05H15RGKBA]
- FG collaborative research centre [TR 16]
- Austrian Science Fund (FWF) [J 3392, P 29216] Funding Source: researchfish
- Austrian Science Fund (FWF) [J3392, P29216] Funding Source: Austrian Science Fund (FWF)
We review the spectrum and electromagnetic properties of baryons described as relativistic three-quark bound states within QCD. 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. We discuss the progress in these fields from a theoretical perspective, focusing on nonperturbative QCD as encoded in the functional approach via Dyson-Schwinger and Bethe-Salpeter equations. We give a systematic overview as to how results are obtained in this framework and explain technical connections to lattice QCD. We also discuss the mutual relations to the quark model, which still serves as a reference to distinguish 'expected' from 'unexpected' physics. We confront recent results on the spectrum of non-strange and strange baryons, their form factors and the issues of two-photon processes and Compton scattering determined in the Dyson-Schwinger framework 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. (C) 2016 Elsevier B.V. All rights reserved.
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