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In a series of recent papers, Johnson, Baker, and Willey study quantum electrodynamics with internal photon self-energy parts omitted. They find that in this model the asymptotic electron and photon propagators have remarkable, simple properties. In the present note we show that these properties can be derived in a very economical fashion by using the Callan-Symanzik scaling equations.
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Adler et al. (1971) studied this question.
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