Super-leading logarithms in non-global observables in QCD? | Zendy

J. R. Forshaw | Zendy; Albrecht Kyrieleis | Zendy; Michael H. Seymour | Zendy

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Super-leading logarithms in non-global observables in QCD?

Author(s) -

J. R. Forshaw,

Albrecht Kyrieleis,

Michael H. Seymour

Publication year - 2006

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/2006/08/059

Subject(s) - physics , observable , quantum chromodynamics , logarithm , particle physics , gluon , coherence (philosophical gambling strategy) , coulomb , nuclear physics , quantum mechanics , mathematical analysis , mathematics , electron

We reconsider the calculation of a non-global QCD observable and find thepossible breakdown of QCD coherence. This breakdown arises as a result of wideangle soft gluon emission developing a sensitivity to emission at small anglesand it leads to the appearance of super-leading logarithms. We use the `gapsbetween jets' cross-section as a concrete example and illustrate that the newlogarithms are intimately connected with the presence of Coulomb gluoncontributions. We present some rough estimates of their potentialphenomenological significance.Comment: 21 pages, 7 figure

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