Systematics of quark/gluon tagging

A bstract 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 F versus C A ). In this paper, we confront the challenges faced wh...

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Bibliographic Details
Published in:The journal of high energy physics 2017-07, Vol.2017 (7), p.1-50, Article 91
Main Authors: Gras, Philippe, Höche, Stefan, Kar, Deepak, Larkoski, Andrew, Lönnblad, Leif, Plätzer, Simon, Siódmok, Andrzej, Skands, Peter, Soyez, Gregory, Thaler, Jesse
Format: Article
Language:English
Subjects:
Classical and Quantum Gravitation
Color
Discrimination
Elementary Particles
Fysik
Generators
High energy physics
High Energy Physics - Experiment
High Energy Physics - Phenomenology
Jets
Large Hadron Collider
Marking
Natural Sciences
Naturvetenskap
Particle collisions
Physical Sciences
Physics
Physics and Astronomy
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
QCD Phenomenology
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Regular Article - Theoretical Physics
Relativity Theory
String Theory
Subatomic Physics
Subatomär fysik
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Summary:A bstract 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 F versus C 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.
ISSN:1029-8479
1126-6708
1029-8479
DOI:10.1007/JHEP07(2017)091