Compton Scattering and the Spin Structure of the Nucleon at Low Energies

Abstract

We analyze polarized Compton scattering which provides information on the spin-structure of the nucleon. For scattering processes with photon energies up to 100 MeV the spin-structure dependence can be encoded into four independent parameters-the so-called spin-polarizabilities ${\gamma }_i,i=\mathrm{1...4}$ of the nucleon, which we calculate within the framework of the "small scale expansion" in SU(2) baryon chiral perturbation theory. Specific application is made to "forward" and "backward" spin- polarizabilities.

Comments: 8 pages revtex file, separation between pion-pole and regular contributions detailed + minor wording changes, results and conclusions unchanged