Super-leading logarithms in non-global observables in QCD?

Details Super-leading logarithms in non-global observables in QCD? Super-leading logarithms in non-global observables in QCD?

2006-04-11

arxiv.org/abs/hep-ph/0604094v2

JHEP0608:059,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages, 7 figures

Scientific paper

10.1088/1126-6708/2006/08/059

We reconsider the calculation of a non-global QCD observable and find the possible breakdown of QCD coherence. This breakdown arises as a result of wide angle soft gluon emission developing a sensitivity to emission at small angles and it leads to the appearance of super-leading logarithms. We use the `gaps between jets' cross-section as a concrete example and illustrate that the new logarithms are intimately connected with the presence of Coulomb gluon contributions. We present some rough estimates of their potential phenomenological significance.

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