Nucleon in a periodic magnetic field
  The energy shift of a nucleon in a static periodic magnetic field is evaluated at second order in the external field strength in perturbation theory. It is shown that the measurement of this energy shift on the lattice allows one to determine the unknown subtraction function in the forward doubly virtual Compton scattering amplitude. The limits of applicability of the obtained formula for the energy shift are discussed. 
Andria Agadjanov, Ulf-G. Mei{\ss}ner, Akaki Rusetsky
hep-lat hep-ph