Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2002-09-18
Physics
Nuclear Physics
Nuclear Theory
10 pages, 2 figures, Talk given at the symposium on the "Gerasimov-Drell- Hearn Sum Rule and the Nucleon Spin Structure in the
Scientific paper
The main features of the resonance structure of the nucleon are discussed, particular with regard to the helicity dependence of real and virtual photoabsorption. The dependence of the partial cross sections on both the resonance helicity amplitudes and the electromagnetic multipoles is outlined. The general structure of the Compton tensor is reviewed and applied to the special cases of real to real, virtual to real, and virtual to virtual Compton scattering. Recent theoretical developments in dispersion relations are presented, together with a short overview regarding static, dynamical, and generalized polarizabilities of the nucleon as well as the status of the Gerasimov-Drell-Hearn sum rule and related integrals.
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