Systematics of quark/gluon tagging
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13130_2017_Article_6376.pdf
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1.9 MB
Format
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Author(s)
Gras, Philippe
Höche, Stefan
Kar, Deepak
Larkoski, Andrew
Lönnblad, Leif
Plätzer, Simon
Siódmok, Andrzej
Skands, Peter
Soyez, Gregory
Thaler, Jesse
Date Issued
July 2017
Journal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
Gras, Philippe et al. “Systematics of Quark/Gluon Tagging.” Journal of High Energy Physics 2017.7 (2017): n. pag.
Version
Final published version
Abstract
By measuring the substructure of a jet, one can assign it a “quark” or “gluon” tag. In the eikonal (double-logarithmic) limit, quark/gluon discrimination is determined solely by the color factor of the initiating parton (C[subscript F] versus C[subscript A]). In this paper, we confront the challenges faced when going beyond this leading-order understanding, using both parton-shower generators and first-principles calculations to assess the impact of higher-order perturbative and nonperturbative physics. Working in the idealized context of electron-positron collisions, where one can define a proxy for quark and gluon jets based on the Lorentz structure of the production vertex, we find a fascinating interplay between perturbative shower effects and nonperturbative hadronization effects. Turning to proton-proton collisions, we highlight a core set of measurements that would constrain current uncertainties in quark/gluon tagging and improve the overall modeling of jets at the Large Hadron Collider.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.1007/JHEP07(2017)091
