Super-leading logarithms in non-global observables in QCD?
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.
- Publication:
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Journal of High Energy Physics
- Pub Date:
- August 2006
- DOI:
- 10.1088/1126-6708/2006/08/059
- arXiv:
- arXiv:hep-ph/0604094
- Bibcode:
- 2006JHEP...08..059F
- Keywords:
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- High Energy Physics - Phenomenology
- E-Print:
- 21 pages, 7 figures