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DOE OSTI · 1035076

Angular Scaling In Jets

Jankowiak, Martin·Larkoski, Andrew J
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Abstract

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.

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDSANGULAR CORRELATIONANGULAR DISTRIBUTIONCORRELATION FUNCTIONSJET MODELMONTE CARLO METHODPhenomenology-HEP,HEPTHQUANTUM CHROMODYNAMICSRESOLUTIONSHAPETUNING

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Jankowiak, Martin, Larkoski, Andrew J. 2012-02-17. Angular Scaling In Jets. https://doi.org/10.1007/jhep04(2012)039

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