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Systematics of quark/gluon tagging

Gras, Philippe; Höche, Stefan; Kar, Deepak; Larkoski, Andrew; Lönnblad, Leif LU ; 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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Please use this url to cite or link to this publication:
author
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
publisher
Springer
external identifiers
  • scopus:85025092222
  • wos:000406022500004
ISSN
1126-6708
DOI
10.1007/JHEP07(2017)091
language
English
LU publication?
yes
id
099c50bb-b987-4e58-bdaa-894551b47e60
date added to LUP
2017-07-31 11:03:42
date last changed
2017-09-18 11:40:28
@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>},
  articleno    = {91},
  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         = {1126-6708},
  keyword      = {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},
  volume       = {2017},
  year         = {2017},
}