Journal
PROGRESS IN PARTICLE AND NUCLEAR PHYSICS, VOL 61, NO 1
Volume 61, Issue 1, Pages 50-65Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ppnp.2007.12.034
Keywords
Bethe-Salpeter equations; confinement; dynamical chiral symmetry breaking; Dyson-Schwinger equations; covariant Faddeev equation; meson spectroscopy; nucleon form factors; hadron physics
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An overview of the theory and phenomenology of hadrons and QCD is provided from a Dyson-Schwinger equation viewpoint. Following a discussion of the definition and realization of light-quark confinement, the nonperturbative nature of the running mass in QCD and inferences from the gap equation relating to the radius of convergence for expansions of observables in the current-quark mass are described. Some exact results for pseudoscalar mesons are also highlighted, with details relating to the U-A(1) problem, and calculated masses of the lightest J = 0, 1 states are discussed. Studies of nucleon properties are recapitulated upon and illustrated: through a comparison of the In-weighted ratios of Pauli and Dirac form factors for the neutron and proton; and a perspective on the contribution of quark orbital angular momentum to the spin of a nucleon at rest. Comments on prospects for the future of the study of quarks in hadrons and nuclei round out the contribution. (c) 2008 Elsevier B.V. All rights reserved.
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