Delbruck scattering and the g-factor of a bound electron
arXiv:hep-ph/0210069 · doi:10.1016/S0370-2693(02)02930-1
Abstract
The leading contribution of the light-by-light scattering effects to g-factor of a bound electron is derived. The corresponding amplitude is expressed in terms of low-energy Delbruck scattering of a virtual photon. The result reads Delta g = (7/216) alpha (Z alpha)^5.