A new treatment of mixed virtual and real IR-singularities

Details A new treatment of mixed virtual and real IR-singularities A new treatment of mixed virtual and real IR-singularities

2008-01-28

arxiv.org/abs/0801.4228v1

PoSRADCOR2007:007,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, latex, to appear in the proceedings of 8th International Symposium on Radiative Corrections (RADCOR 2007): Applicatio

Scientific paper

We discuss the determination of the infrared singularities of massive one-loop 5-point functions with Mellin-Barnes (MB) representations. Massless internal lines may lead to poles in the $\eps$ expansion of the Feynman diagram, while unresolved massless final state particles give endpoint singularities of the phase space integrals. MB integrals are an elegant tool for their common treatment. An evaluation by taking residues leads to inverse binomial sums.

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