Model for relativistic bound-state perturbation theory

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Abstract
A model for relativistic bound-state perturbation theory is presented. For the bound-state wave function needed in the perturbation formula, the covariant-harmonic-oscillator wave function is used. As for the perturbing potential, the Feynman propagator corresponding to one-meson exchange is used. This model produces a relativistic derivation of the Breit-Fermi formula, which was recently used by De Rújula, Georgi, and Glashow in their study of hadronic masses.