Relativistic corrections to the electromagnetic polarizabilities of compound systems - art. no. 032507

The low-energy amplitude of Compton scattering on the bound state of two ch arged particles of arbitrary masses, charges, and spins is obtained. A case in which the bound state exists due to electromagnetic interaction is cons idered. The term, proportional to omega (2), is obtained taking into accoun t the first relativistic correction. It is shown that the complete result f or this correction differs essentially from the commonly used term Delta al pha, proportional to the rms charge radius of the system. We propose that t he same situation can take place in the more complicated case of hadrons.