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Systematics of quark/gluon tagging

Gras, Philippe ; Höche, Stefan ; Kar, Deepak ; Larkoski, Andrew ; Lönnblad, Leif LU orcid ; Plätzer, Simon LU ; Siódmok, Andrzej ; Skands, Peter LU ; Soyez, Gregory and Thaler, Jesse (2017) In Journal of High Energy Physics 2017(7).
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 (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... (More)

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.

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author
; ; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Jets, QCD Phenomenology
in
Journal of High Energy Physics
volume
2017
issue
7
article number
91
publisher
Springer
external identifiers
  • wos:000406022500004
  • scopus:85025092222
ISSN
1029-8479
DOI
10.1007/JHEP07(2017)091
project
QCD Phenomenology and Event Generator Development
Innovative Network for Monte Carlo Event Generators for LHC Physics
language
English
LU publication?
yes
id
099c50bb-b987-4e58-bdaa-894551b47e60
date added to LUP
2017-07-31 11:03:42
date last changed
2024-04-14 15:08:29
@article{099c50bb-b987-4e58-bdaa-894551b47e60,
  abstract     = {{<p>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<sub>F</sub> versus C<sub>A</sub>). 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.</p>}},
  author       = {{Gras, Philippe and Höche, Stefan and Kar, Deepak and Larkoski, Andrew and Lönnblad, Leif and Plätzer, Simon and Siódmok, Andrzej and Skands, Peter and Soyez, Gregory and Thaler, Jesse}},
  issn         = {{1029-8479}},
  keywords     = {{Jets; QCD Phenomenology}},
  language     = {{eng}},
  month        = {{07}},
  number       = {{7}},
  publisher    = {{Springer}},
  series       = {{Journal of High Energy Physics}},
  title        = {{Systematics of quark/gluon tagging}},
  url          = {{http://dx.doi.org/10.1007/JHEP07(2017)091}},
  doi          = {{10.1007/JHEP07(2017)091}},
  volume       = {{2017}},
  year         = {{2017}},
}