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Steps towards NNLO QCD calculations: collinear factorization at O(αS2)

M. Grazzini

hep-pharXiv:hep-ph/9905385

Abstract

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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