Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-12-03
Nucl.Phys. B685 (2004) 321-350
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages
Scientific paper
10.1016/j.nuclphysb.2004.03.002
Resummations of soft gluon emissions play an important role in many applications of QCD, among them jet observables and small x saturation effects. Banfi, Marchesini, and Smye have derived an evolution equation for non-global jet observables that exhibits a remarkable analogy with the BK equation used in the small x context. Here, this analogy is used to generalize the former beyond the leading N_c approximation. The result shows striking analogy with the JIMWLK equation describing the small x evolution of the color glass condensate. A Langevin description allows numerical implementation and provides clues for the formulation of closed forms for amplitudes at finite N_c. The proof of the new equation is based on these amplitudes with ordered soft emission. It is fully independent of the derivation of the JIMWLK equation and thus sheds new light also on this topic.
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