Super-leading logarithms in non-global observables in QCD?
arXiv:hep-ph/0604094 · doi:10.1088/1126-6708/2006/08/059
Abstract
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.
21 pages, 7 figures
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