arXiv:0905.1403·v1·High Energy Physics — Phenomenology
Non-abelian infra-red cancellations in the unintegrated NLO kernel
Magdalena Slawinska🇵🇱 · Aleksander Kusina🇵🇱
Abstract
We investigate the infrared singularity structure of Feynman diagrams entering the next-to-leading-order (NLO) DGLAP kernel (non-singlet). We examine cancellations between diagrams for two gluon emission contributing to NLO kernels. We observe the crucial role of color coherence effects in cancellations of infra-red singularities. Numerical calculations are explained using analytical formulas for the singular contributions.
Comments: 13 pages, 8 figures