Initial States: IR and Collinear Divergences

Details Initial States: IR and Collinear Divergences Initial States: IR and Collinear Divergences

2006-07-24

arxiv.org/abs/hep-ph/0607262v1

Nucl.Phys.Proc.Suppl.174:51-54,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, talk given at Montpellier meeting QCD'06 (to appear in the proceedings)

Scientific paper

10.1016/j.nuclphysbps.2007.08.08

The standard approach to the infra-red problem is to use the Bloch-Nordsieck trick to handle soft divergences and the Lee-Nauenberg (LN) theorem for collinear singularities. We show that this is inconsistent in the presence of massless initial particles. Furthermore, we show that using the LN theorem with such initial states introduces a non-convergent infinite series of diagrams at any fixed order in perturbation theory.

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