Precision Jet Substructure from Boosted Event Shapes
Name
Feige-2012-Precision jet substructure from boosted event shapes.pdf
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Author(s)
Feige, Ilya
Schwartz, Matthew D.
Stewart, Iain
Thaler, Jesse
Date Issued
August 2012
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Feige, Ilya et al. “Precision Jet Substructure from Boosted Event Shapes.” Physical Review Letters 109.9 (2012). © 2012 American Physical Society
Version
Final published version
Abstract
Jet substructure has emerged as a critical tool for LHC searches, but studies so far have relied heavily on shower Monte Carlo simulations, which formally approximate QCD at the leading-log level. We demonstrate that systematic higher-order QCD computations of jet substructure can be carried out by boosting global event shapes by a large momentum Q and accounting for effects due to finite jet size, initial-state radiation (ISR), and the underlying event (UE) as 1/Q corrections. In particular, we compute the 2-subjettiness substructure distribution for boosted Z→q[bar over q] events at the LHC at next-to-next-to-next-to-leading-log order. The calculation is greatly simplified by recycling known results for the thrust distribution in e[superscript +]e[superscript -] collisions. The 2-subjettiness distribution quickly saturates, becoming Q independent for Q≳400 GeV. Crucially, the effects of jet contamination from ISR/UE can be subtracted out analytically at large Q without knowing their detailed form. Amusingly, the Q=∞ and Q=0 distributions are related by a scaling by e up to next-to-leading-log order.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.109.092001
