Going off topics to demix quark and gluon jets in αS extractions

• Verfasst von: LeBlanc, Matt [VerfasserIn]
• Verfasst von: Nachman, Benjamin [VerfasserIn]
• Verfasst von: Sauer, Christof [VerfasserIn]
• Titel: Going off topics to demix quark and gluon jets in αS extractions
• Verf.angabe: Matt LeBlanc, Benjamin Nachman and Christof Sauer
• E-Jahr: 2023
• Jahr: 15 February 2023
• Umfang: 20 S.
• Fussnoten: Im Titel ist der Buchstabe "S" tiefgestellt ; Gesehen am 28.03.2023
• Titel Quelle: Enthalten in: Journal of high energy physics
• Ort Quelle: Berlin : Springer, 1997
• Jahr Quelle: 2023
• Band/Heft Quelle: (2023), 2 vom: Feb., Artikel-ID 150, Seite 1-20
• ISSN Quelle: 1029-8479
• DOI: doi:10.1007/JHEP02(2023)150
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Jets and Jet Substructure
• Sach-SW: The Strong Coupling
• K10plus-PPN: 184031110X

Abstract

Quantum chromodynamics is the theory of the strong interaction between quarks and gluons; the coupling strength of the interaction, αS, is the least precisely-known of all interactions in nature. An extraction of the strong coupling from the radiation pattern within jets would provide a complementary approach to conventional extractions from jet production rates and hadronic event shapes, and would be a key achievement of jet substructure at the Large Hadron Collider (LHC). Presently, the relative fraction of quark and gluon jets in a sample is the limiting factor in such extractions, as this fraction is degenerate with the value of αS for the most well-understood observables. To overcome this limitation, we apply recently proposed techniques to statistically demix multiple mixtures of jets and obtain purified quark and gluon distributions based on an operational definiton. We illustrate that studying quark and gluon jet substructure separately can significantly improve the sensitivity of such extractions of the strong coupling. We also discuss how using machine learning techniques or infrared- and collinear-unsafe information can improve the demixing performance without the loss of theoretical control. While theoretical research is required to connect the extract topics with the quark and gluon objects in cross section calculations, our study illustrates the potential of demixing to reduce the dominant uncertainty for the αS extraction from jet substructure at the LHC.