A new treatment of mixed virtual and real IR-singularities

Janusz Gluza; Tord Riemann

A new treatment of mixed virtual and real IR-singularities

High Energy Physics - Phenomenology 2009-04-14 v1

Authors: Janusz Gluza , Tord Riemann

Abstract

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.

Keywords

infrared singularities massive one-loop 5-point functions Mellin-Barnes representations Feynman diagrams phase space integrals inverse binomial sums

Cite

@article{arxiv.0801.4228,
  title  = {A new treatment of mixed virtual and real IR-singularities},
  author = {Janusz Gluza and Tord Riemann},
  journal= {arXiv preprint arXiv:0801.4228},
  year   = {2009}
}

Comments

8 pages, latex, to appear in the proceedings of 8th International Symposium on Radiative Corrections (RADCOR 2007): Application of Quantum Field Theory to Phenomenology, Florence, Italy, 1-5 Oct 2007

A new treatment of mixed virtual and real IR-singularities

Abstract

Keywords

Cite

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