Infrared Divergences from Soft and Collinear Gauge Bosons

Details Infrared Divergences from Soft and Collinear Gauge Bosons Infrared Divergences from Soft and Collinear Gauge Bosons

2007-09-25

arxiv.org/abs/0709.3935v1

ECONFC0706044:27,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 6 .jpg figures. Talk given at the Ninth Workshop on Non-Perturbative QCD, Paris, June 2007

Scientific paper

I review the Lee-Nauenberg thereom and discuss its inclusion of photons which are disconnected at the level of the S-matrix but connected at the level of the cross-section when there are initial and final state charged particles. I then expose a new set of soft collinear divergences in massless gauge theories which are omitted in the standard Lee-Nauenberg approach. It seems that highly questionable assumptions are needed to obtain finite cross-sections.

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