Super-leading logarithms in non-global observables in QCD: Fixed order calculation

Abstract

Super-leading logarithmic terms have previously been observed in non-global QCD observables. In this paper we re-calculate the first super-leading contribution to the `gaps between jets' cross-section using a diagrammatic fixed order approach. We calculate for the first time the super-leading contribution at fifth order in alpha_s.

18 pages, 7 figures

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• Non-global logarithms up to four loops at finite-N${}_c$ for V/H+jet processes at hadron colliders
• Catani's generalization of collinear factorization breaking