We have examined the structure of leading infrared divergences of the S-matrix elements for nonexceptional momentum configurations for an arbitrary number of massive quarks and color-singlet external sources in non-Abelian gauge theories. it is shown that the sum of all these divergences satisfies a simple differential equation with respect to the space-time dimension as an infrared cutoff.
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Kinoshita et al. (1977) studied this question.
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