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Systematics of quark/gluon tagging
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- Gras, Philippe (author)
- University of Paris-Saclay
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- Höche, Stefan (author)
- Stanford Linear Accelerator Center (SLAC)
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- Kar, Deepak (author)
- University of the Witwatersrand
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- (creator_code:org_t)
- 2017
- 2017
- English.
- In: Journal of High Energy Physics. - 1029-8479. ; 2017:7
- Journal article (peer-reviewed)
Abstract
Subject headings
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- 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 (CF versus CA). 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
Keyword
- Jets
- QCD Phenomenology
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
- Gras, Philippe
- Höche, Stefan
- Kar, Deepak
- Larkoski, Andrew
- Lönnblad, Leif
- Plätzer, Simon
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- Siódmok, Andrzej
- Skands, Peter
- Soyez, Gregory
- Thaler, Jesse
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- About the subject
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- NATURAL SCIENCES
- NATURAL SCIENCES
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- Lund University
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