Virtual Compton Scattering off the nucleon in the linear sigma model
  Virtual Compton scattering off the nucleon has been studied in the one-loop approximation of the linear sigma model. The three generalized polarizabilities of the nucleon have been calculated and compared with the existing theoretical predictions. In particular, we find that only two of the three scalar polarizabilities are independent observables. 
A. Metz and D. Drechsel (University of Mainz, Germany)