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- Journal Article
We compute in conventional dimensional regularisation the tree-level splitting amplitudes for a quark parent in the limit where four partons become collinear to each other. This is part of the universal infrared behaviour of the QCD scattering amplitudes at next-to-next-to-next-to-leading order ((NLO)-L-3) in the strong coupling constant. Further, we consider the iterated limit when m(') massless partons become collinear to each other within a bigger set of m collinear partons, as well as the limits when one gluon or a qq over bar pair or two gluons become soft within a set of m collinear partons. Show more
Journal / seriesJournal of High Energy Physics
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