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SINGLETIME BOUND STATE EQUATION
0mZa nZa AND omZa
SOME CONSEQUENCES FOR HIGHER ORDER HYPERFINE STRUCTURE
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annihilation graphs arising axial gauges B-S equation B-S irreducible kernel B-S kernel B-S wave function Bethe-Salpeter equation binding energy bound state energies bound state equation bound state systems center of mass Chapter charge conjugation class of covariant consider cont'd contribution to AE Coulomb photon exchange covariant gauges crossed photon kernel Dirac dominant binding dominant contributions electromagnetic bound energy eigenvalues energy shift expression F-W transformations Feynman gauge Figure full B-S gauge invariant given in Fig higher order hyperfine splitting hyperfine structure infinite number instantaneous interactions instantaneous piece integral equation iteration ladder approximation leading contribution m(Za mass shell muonium n(Za non-instantaneous ladders non-instantaneous photon non-radiation gauges number of kernels obtain particle particle-antiparticle bound perturbation theory photon crossing photon propagator Pole configurations positronium radiation gauge relative time coordinate Salpeter equation scalar Schrodinger equation Section single photon exchange single-time bound time-ordered two-body Green function two-fermion bound unperturbed wave functions