Photon-Photon Scattering Contribution to the Anomalous Magnetic Moment of the Muon

Abstract
A careful and systematic recomputation of the photon-photon scattering contribution to the muon magnetic-moment anomaly is made. The result is Δaphph=(21.32±0.05)(απ)3 leading to the theoretical value aμth=(1165918±10)×109.