Through four loops, multi-particle collinear limits of massless scattering amplitudes impose no constraints beyond two-particle collinear limits, while a massive colored parton yields a new three-particle collinear constraint.
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Infrared singularities and the collinear limits of multi-leg scattering amplitudes
Through four loops, multi-particle collinear limits of massless scattering amplitudes impose no constraints beyond two-particle collinear limits, while a massive colored parton yields a new three-particle collinear constraint.