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We elaborate on the radiative behavior of tree-level scattering amplitudes in the soft regime. We show that the subleading soft term in single-gluon emission of quark-gluon amplitudes in QCD is controlled by differential operators, whose universal form can be derived from both on-shell recursion and gauge invariance, as it was shown to hold for graviton and gluon scattering.
Luo et al. (Mon,) studied this question.
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