Initial States: IR and Collinear Divergences

Abstract

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.

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

References in corpus (2)

• Collinearity, convergence and cancelling infrared divergences
• The KLN Theorem and Soft Radiation in Gauge Theories: Abelian Case

Cited by in corpus (5)

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