Nucleon polarizabilities in real and virtual Compton scattering: Recent theoretical issues
1 Dipartimento di Fisica Nucleare e Teorica, Università degli Studi di Pavia, and INFN, Sezione di Pavia, 27100 Pavia, Italy
2 Institut für Kernphysik, Johannes Gutenberg-Universität, 55099 Mainz, Germany
Revised: 21 July 2011
Published online: 23 September 2011
We review recent developments in the theoretical investigation of the nucleon polarizabilities. We first report on the static polarizabilities as measured in real Compton scattering, comparing and interpreting the results from various theoretical approaches. In a second step, we extend the discussion to the generalized polarizabilities which can be accessed in virtual Compton scattering, showing how the information encoded in these quantities can provide a spatial interpretation of the induced polarization densities in the nucleon.
© EDP Sciences, Springer-Verlag, 2011