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Breakdown of QCD coherence ?

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arxiv hep-ph/0612202 v1 pith:AWP3VHJR submitted 2006-12-16 hep-ph

Breakdown of QCD coherence ?

classification hep-ph
keywords breakdowncoherenceemissiongluonlogarithmsangleanglesappearance
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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