In the context of a subtraction method for jet cross sections at NNLO accuracy in the strong coupling, we perform the integration over the two-particle factorised phase space of the collinear-type contributions to the doubly unresolved counterterms. We present the final result as a convolution in colour space of the Born cross section and of an insertion operator, which is written in terms of master integrals that we expand in the dimensional regularisation parameter.
@article{arxiv.1301.3504,
title = {Integration of collinear-type doubly unresolved counterterms in NNLO jet cross sections},
author = {Vittorio Del Duca and Gabor Somogyi and Zoltan Trocsanyi},
journal= {arXiv preprint arXiv:1301.3504},
year = {2015}
}