Theory and phenomenology of non-global logarithms

Details Theory and phenomenology of non-global logarithms Theory and phenomenology of non-global logarithms

2003-05-21

arxiv.org/abs/hep-ph/0305232v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Based on talks presented at the XXXVIIIth Rencontres de Moriond 'QCD and high-energy hadronic interactions', 8 pages

Scientific paper

We discuss the theoretical treatment of non-global observables, those quantities that are sensitive only to radiation in a restricted region of phase space, and describe how large `non-global' logarithms arise when we veto the energy flowing into the restricted region. The phenomenological impact of non-global logarithms is then discussed, drawing on examples from event shapes in DIS and energy-flow observables in 2-jet systems. We then describe techniques to reduce the numerical importance of non-global logarithms, looking at clustering algorithms in energy flow observables and the study of associated distribution of multiple observables.

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