XCone: N-jettiness as an exclusive cone jet algorithm
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13130_2015_Article_2487.pdf
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Author(s)
Thaler, Jesse
Tackmann, Frank J.
Vermilion, Christopher K.
Wilkason, Thomas F.
Stewart, Iain
Date Issued
November 2015
Journal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
Stewart, Iain W. et al. “XCone: N-Jettiness as an Exclusive Cone Jet Algorithm.” Journal of High Energy Physics 2015.11 (2015): n. pag.
Version
Final published version
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.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1007/JHEP11(2015)072
