Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-01-26
Eur.Phys.J.A28:71-80,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, prepared for proceedings of Symposium on 20 Years of Physics at the Mainz Mikrotron
Scientific paper
It is reviewed how Compton scattering sum rules relate low-energy nucleon structure quantities to the nucleon excitation spectrum. In particular, the GDH sum rule and recently proposed extensions of it will be discussed. These extensions are sometimes more calculationally robust, which may be an advantage when estimating the chiral extrapolations of lattice QCD results, such as for anomalous magnetic moments. Subsequently, new developments in our description of the nucleon excitation spectrum will be discussed, in particular a recently developed chiral effective field theory framework for the $\Delta(1232)$-resonance region. Within this framework, we discuss results on $N$ and $\Delta$ masses, the $\gamma N \Delta$ transition and the $\Delta$ magnetic dipole moment.
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