The Lund jet plane
Lund diagrams, a theoretical representation of the phase space within jets, have long been used in discussing parton showers and resummations. We point out that they can be created for individual jets through repeated Cambridge/Aachen declustering, providing a powerful visual representation of the r...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
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Springer Berlin Heidelberg
2019
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| Online Access: | http://hdl.handle.net/1721.1/119851 |
| _version_ | 1811076345633964032 |
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| author | Soyez, Grégory Salam, Gavin P. Dreyer, Frederic |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Soyez, Grégory Salam, Gavin P. Dreyer, Frederic |
| author_sort | Soyez, Grégory |
| collection | MIT |
| description | Lund diagrams, a theoretical representation of the phase space within jets, have long been used in discussing parton showers and resummations. We point out that they can be created for individual jets through repeated Cambridge/Aachen declustering, providing a powerful visual representation of the radiation within any given jet. Concentrating here on the primary Lund plane, we outline some of its analytical properties, highlight its scope for constraining Monte Carlo simulations and comment on its relation with existing observables such as the zg variable and the iterated soft-drop multiplicity. We then examine its use for boosted electroweak boson tagging at high momenta. It provides good performance when used as an input to machine learning. Much of this performance can be reproduced also within a transparent log-likelihood method, whose underlying assumption is that different regions of the primary Lund plane are largely decorrelated. This suggests a potential for unique insight and experimental validation of the features being used by machine-learning approaches. Keywords: Jets, QCD Phenomenology |
| first_indexed | 2024-09-23T10:19:56Z |
| format | Article |
| id | mit-1721.1/119851 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T10:19:56Z |
| publishDate | 2019 |
| publisher | Springer Berlin Heidelberg |
| record_format | dspace |
| spelling | mit-1721.1/1198512022-09-26T17:16:04Z The Lund jet plane Soyez, Grégory Salam, Gavin P. Dreyer, Frederic Massachusetts Institute of Technology. Department of Physics Dreyer, Frederic Lund diagrams, a theoretical representation of the phase space within jets, have long been used in discussing parton showers and resummations. We point out that they can be created for individual jets through repeated Cambridge/Aachen declustering, providing a powerful visual representation of the radiation within any given jet. Concentrating here on the primary Lund plane, we outline some of its analytical properties, highlight its scope for constraining Monte Carlo simulations and comment on its relation with existing observables such as the zg variable and the iterated soft-drop multiplicity. We then examine its use for boosted electroweak boson tagging at high momenta. It provides good performance when used as an input to machine learning. Much of this performance can be reproduced also within a transparent log-likelihood method, whose underlying assumption is that different regions of the primary Lund plane are largely decorrelated. This suggests a potential for unique insight and experimental validation of the features being used by machine-learning approaches. Keywords: Jets, QCD Phenomenology Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (Grant P2SKP2-165039) United States. Department of Energy. Office of High Energy and Nuclear Physics (Grant DE-SC-0012567) 2019-01-04T15:30:11Z 2019-01-04T15:30:11Z 2018-12 2018-07 2018-12-16T04:14:13Z Article http://purl.org/eprint/type/JournalArticle 1029-8479 http://hdl.handle.net/1721.1/119851 Dreyer, Frédéric A., et al. “The Lund Jet Plane.” Journal of High Energy Physics, vol. 2018, no. 12, Dec. 2018. © 2018 The Authors en https://doi.org/10.1007/JHEP12(2018)064 Journal of High Energy Physics Creative Commons Attribution https://creativecommons.org/licenses/by/4.0/ The Author(s) application/pdf Springer Berlin Heidelberg Springer Berlin Heidelberg |
| spellingShingle | Soyez, Grégory Salam, Gavin P. Dreyer, Frederic The Lund jet plane |
| title | The Lund jet plane |
| title_full | The Lund jet plane |
| title_fullStr | The Lund jet plane |
| title_full_unstemmed | The Lund jet plane |
| title_short | The Lund jet plane |
| title_sort | lund jet plane |
| url | http://hdl.handle.net/1721.1/119851 |
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