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Profile picture of Leif Lönnblad. Photo.

Leif Lönnblad

Professor of Theoretical Physics

Profile picture of Leif Lönnblad. Photo.

Systematics of quark/gluon tagging

Author

  • Philippe Gras
  • Stefan Höche
  • Deepak Kar
  • Andrew Larkoski
  • Leif Lönnblad
  • Simon Plätzer
  • Andrzej Siódmok
  • Peter Skands
  • Gregory Soyez
  • Jesse Thaler

Summary, in English

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.

Department/s

  • Theoretical Particle Physics

Publishing year

2017-07-01

Language

English

Publication/Series

Journal of High Energy Physics

Volume

2017

Issue

7

Document type

Journal article

Publisher

Springer

Topic

  • Subatomic Physics

Keywords

  • Jets
  • QCD Phenomenology

Status

Published

Project

  • QCD Phenomenology and Event Generator Development
  • Innovative Network for Monte Carlo Event Generators for LHC Physics

ISBN/ISSN/Other

  • ISSN: 1029-8479