An operational definition of quark and gluon jets
While “quark” and “gluon” jets are often treated as separate, well-defined objects in both theoretical and experimental contexts, no precise, practical, and hadron-level definition of jet flavor presently exists. To remedy this issue, we develop and advocate for a data-driven, operational definition...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
Springer Nature
2018
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| Online Access: | http://hdl.handle.net/1721.1/118991 https://orcid.org/0000-0002-2406-8160 |
| _version_ | 1826217141479669760 |
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| author | Komiske, Patrick T. Metodiev, Eric Mario Thaler, Jesse |
| author2 | Massachusetts Institute of Technology. Center for Theoretical Physics |
| author_facet | Massachusetts Institute of Technology. Center for Theoretical Physics Komiske, Patrick T. Metodiev, Eric Mario Thaler, Jesse |
| author_sort | Komiske, Patrick T. |
| collection | MIT |
| description | While “quark” and “gluon” jets are often treated as separate, well-defined objects in both theoretical and experimental contexts, no precise, practical, and hadron-level definition of jet flavor presently exists. To remedy this issue, we develop and advocate for a data-driven, operational definition of quark and gluon jets that is readily applicable at colliders. Rather than specifying a per-jet flavor label, we aggregately define quark and gluon jets at the distribution level in terms of measured hadronic cross sections. Intuitively, quark and gluon jets emerge as the two maximally separable categories within two jet samples in data. Benefiting from recent work on data-driven classifiers and topic modeling for jets, we show that the practical tools needed to implement our definition already exist for experimental applications. As an informative example, we demonstrate the power of our operational definition using Z+jet and dijet samples, illustrating that pure quark and gluon distributions and fractions can be successfully extracted in a fully well-defined manner. Keyword: Jets |
| first_indexed | 2024-09-23T16:59:00Z |
| format | Article |
| id | mit-1721.1/118991 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T16:59:00Z |
| publishDate | 2018 |
| publisher | Springer Nature |
| record_format | dspace |
| spelling | mit-1721.1/1189912022-09-29T22:49:57Z An operational definition of quark and gluon jets Komiske, Patrick T. Metodiev, Eric Mario Thaler, Jesse Massachusetts Institute of Technology. Center for Theoretical Physics Komiske, Patrick T. Metodiev, Eric Mario Thaler, Jesse While “quark” and “gluon” jets are often treated as separate, well-defined objects in both theoretical and experimental contexts, no precise, practical, and hadron-level definition of jet flavor presently exists. To remedy this issue, we develop and advocate for a data-driven, operational definition of quark and gluon jets that is readily applicable at colliders. Rather than specifying a per-jet flavor label, we aggregately define quark and gluon jets at the distribution level in terms of measured hadronic cross sections. Intuitively, quark and gluon jets emerge as the two maximally separable categories within two jet samples in data. Benefiting from recent work on data-driven classifiers and topic modeling for jets, we show that the practical tools needed to implement our definition already exist for experimental applications. As an informative example, we demonstrate the power of our operational definition using Z+jet and dijet samples, illustrating that pure quark and gluon distributions and fractions can be successfully extracted in a fully well-defined manner. Keyword: Jets 2018-11-13T17:17:43Z 2018-11-13T17:17:43Z 2018-11 2018-10 2018-11-10T05:22:00Z Article http://purl.org/eprint/type/JournalArticle 1029-8479 http://hdl.handle.net/1721.1/118991 Komiske, Patrick T. et al. "An operational definition of quark and gluon jets." Journal of High Energy Physics 2018 (November 2018): 59 © 2018 The Author(s) https://orcid.org/0000-0002-2406-8160 en https://doi.org/10.1007/JHEP11(2018)059 Journal of High Energy Physics Creative Commons Attribution http://creativecommons.org/licenses/by/4.0/ The Author(s) application/pdf Springer Nature Springer Berlin Heidelberg |
| spellingShingle | Komiske, Patrick T. Metodiev, Eric Mario Thaler, Jesse An operational definition of quark and gluon jets |
| title | An operational definition of quark and gluon jets |
| title_full | An operational definition of quark and gluon jets |
| title_fullStr | An operational definition of quark and gluon jets |
| title_full_unstemmed | An operational definition of quark and gluon jets |
| title_short | An operational definition of quark and gluon jets |
| title_sort | operational definition of quark and gluon jets |
| url | http://hdl.handle.net/1721.1/118991 https://orcid.org/0000-0002-2406-8160 |
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