Generalized recoil theorem for soft quantum emission including photon-pair correlations to infinite order in the coupling constant
Leif Matsson · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields · 1974
A generalized recoil theorem to arbitrary order in the coupling constant including photon-pair correlations is derived. The corresponding factorizable (because of pair effects not completely exponentiable) radiative transition rate is valid for an arbitrary process with arbitrarily many particles of arbitrary charge and mass. The theorem is first derived for spinless source particles and then generalized to particles with spin.