Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2007-12-04
Prog.Part.Nucl.Phys.61:50-65,2008
Physics
Nuclear Physics
Nuclear Theory
18 pages, 2 figures. Contribution to the Proceedings of the International School of Nuclear Physics, Erice-Sicily -- 29th Cour
Scientific paper
10.1016/j.ppnp.2007.12.034
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 realisation 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 ln-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.
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