XCone: N-jettiness as an exclusive cone jet algorithmReport as inadecuate

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Journal of High Energy Physics

, 2015:72

First Online: 11 November 2015Received: 11 September 2015Accepted: 20 October 2015 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 1, the physics potential of XCone is demonstrated using the examples of dijet resonances, Higgs decays to bottom quarks, and all-hadronic top pairs.

KeywordsJets QCD Phenomenology ArXiv ePrint: 1508.01516

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Author: Iain W. Stewart - Frank J. Tackmann - Jesse Thaler - Christopher K. Vermilion - Thomas F. Wilkason

Source: https://link.springer.com/

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