A diagrammatic implementation of the generalized renormalization group is developed and used to study the infrared divergences of the photon-quark-quark amplitude in quantum chromodynamics. The leading-log result is simply obtained. We show that nonleading terms cause no qualitative change and that the leading-log result is accurate down to the nonperturbative region. The infrared behavior of QED is discussed as a pedagogical example.
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David Shalloway (1979) studied this question.
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