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Journal of High Energy Physics

A practical seedless infrared-safe cone jet algorithm

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Author

Gavin P. Salam and Grégory Soyez

Affiliations

LPTHE, Université Pierre et Marie Curie - Paris 6, and Université Denis Diderot - Paris 7, CNRS UMR 7589, 75252 Paris cedex 05, France

E-mail

g.soyez@ulg.ac.be

Journal

Journal of High Energy Physics Create an alert RSS this journal

Issue

Volume 2007, JHEP05(2007)

Citation

Gavin P. Salam and Grégory Soyez JHEP05(2007)086

doi: 10.1088/1126-6708/2007/05/086


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Abstract
Current cone jet algorithms, widely used at hadron colliders, take event particles as seeds in an iterative search for stable cones. A longstanding infrared (IR) unsafety issue in such algorithms is often assumed to be solvable by adding extra `midpoint' seeds, but actually is just postponed to one order higher in the coupling. A proper solution is to switch to an exact seedless cone algorithm, one that provably identifies all stable cones. The only existing approach takes N2N time to find jets among N particles, making it unusable at hadron level. This can be reduced to N2 ln N time, leading to code (SISCone) whose speed is similar to that of public midpoint implementations. Monte Carlo tests provide a strong cross-check of an analytical proof of the IR safety of the new algorithm, and the absence of any `Rsep' issue implies a good practical correspondence between parton and hadron levels. Relative to a midpoint cone, the use of an IR safe seedless algorithm leads to modest changes for inclusive jet spectra, mostly through reduced sensitivity to the underlying event, and significant changes for some multi-jet observables.
Keywords

Jets

QCD

PACS

13.87.-a Jets in large-Q2 scattering

12.38.-t Quantum chromodynamics

13.85.Qk Inclusive production with identified leptons, photons, or other nonhadronic particles

Subjects

Particle physics and field theory

Dates

Issue 05 (May 2007)

Received 16 April 2007 , accepted for publication 11 May 2007

Published 29 May 2007



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