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arXiv · 1508.01516

XCone: N-jettiness as an Exclusive Cone Jet Algorithm

Iain W. Stewart·Frank J. Tackmann·Jesse Thaler·Christopher K. Vermilion·Thomas F. Wilkason
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Abstract

We introduce a new jet algorithm called XCone, for eXclusive Cone, which is based on minimizing the event shape N-jettiness. Because N-jettiness partitions every event into N jet regions and a beam region, XCone is an exclusive jet algorithm that always returns a fixed number of jets. We use a new "conical geometric" measure for which well-separated jets are bounded by circles of radius R in the rapidity-azimuth plane, while overlapping jet regions automatically form nearest-neighbor "clover jets". This avoids the split/merge criteria needed in inclusive cone algorithms. A key feature of XCone is that it smoothly transitions between the resolved regime where the N signal jets of interest are well separated and the boosted regime where they overlap. The returned value of N-jettiness also provides a quality criterion of how N-jet-like the event looks. We also discuss the N-jettiness factorization theorems that occur for various jet measures, which can be used to compute the associated exclusive N-jet cross sections. In a companion paper, the physics potential of XCone is demonstrated using the examples of dijet resonances, Higgs decays to bottom quarks, and all-hadronic top pairs.

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Iain W. Stewart, Frank J. Tackmann, Jesse Thaler, Christopher K. Vermilion, Thomas F. Wilkason. 2015-09-10. XCone: N-jettiness as an Exclusive Cone Jet Algorithm. https://doi.org/10.1007/jhep11(2015)072

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