Systematics of quark/gluon tagging
(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
- Gras, Philippe ; Höche, Stefan ; Kar, Deepak ; Larkoski, Andrew ; Lönnblad, Leif LU ; Plätzer, Simon LU ; Siódmok, Andrzej ; Skands, Peter LU ; Soyez, Gregory and Thaler, Jesse
- organization
- publishing date
- 2017-07-01
- 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
-
- scopus:85025092222
- wos:000406022500004
- 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
- 2024-09-02 04:36:07
@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}}, }