Steps towards NNLO QCD calculations: collinear factorization at O(α_S^2)
arXiv:hep-ph/9905385 · doi:10.1016/S0920-5632(99)00747-1
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.
3 pages, 1 eps figure, talk given at the DIS99 Workshop, Zeuthen, Germany, April 19-23, 1999