Breakdown of QCD coherence ?

Details Breakdown of QCD coherence ? Breakdown of QCD coherence ?

2006-12-16

arxiv.org/abs/hep-ph/0612202v1

PoSDIFF2006:031,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 3 figures; proceedings of Workshop on Diffraction in High-Energy Physics - DIFFRACTION 2006, Sep. 5-10 2006, Adamanta

Scientific paper

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. Numerical estimates of their potential phenomenological significance are presented.

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