Steps towards NNLO QCD calculations: collinear factorization at O(α_S²)
classification
✦ hep-ph
keywords
collinearfactorizationalphaamplitudesbecomebehaviourcalculationsconsider
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I consider the singular behaviour of tree-level QCD amplitudes when the momenta of three partons become simultaneously parallel and I discuss the universal factorization formula that controls the singularities of the multiparton matrix elements in this collinear limit.
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