Angular scaling in jets
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We introduce a jet shape observable defined for an ensemble of jets in terms of two-particle angular correlations and a resolution parameter R. This quantity is infrared and collinear safe and can be interpreted as a scaling exponent for the angular distribution of mass inside the jet. For small R it is close to the value 2 as a consequence of the approximately scale invariant QCD dynamics. For large R it is sensitive to non-perturbative effects. We describe the use of this correlation function for tests of QCD, for studying underlying event and pile-up effects, and for tuning Monte Carlo event generators.
KeywordsJets Hadronic Colliders
- F. Takens, Invariants related to dimension and entropy, in Atas do 13°, Colóqkio Brasiliero do Matematica, Rio de Janeiro, Brasil (1983).Google Scholar
- K.G. Wilson, Some experiments on multiple production, Cornell University preprint, U.S.A. (Nov. 1970).Google Scholar
- Herwig++ project page, http://projects.hepforge.org/herwig/trac/wiki/MB UE tunes/.