Precision Jet Substructure from Boosted Event Shapes
Jet substructure has emerged as a critical tool for LHC searches, but studies so far have relied heavily on shower Monte Carlo simulations, which formally approximate QCD at the leading-log level. We demonstrate that systematic higher-order QCD computations of jet substructure can be carried out by...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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American Physical Society
2012
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| Online Access: | http://hdl.handle.net/1721.1/73879 https://orcid.org/0000-0002-2406-8160 https://orcid.org/0000-0003-0248-0979 |
| _version_ | 1826188796148842496 |
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| author | Feige, Ilya Schwartz, Matthew D. Stewart, Iain Thaler, Jesse |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Feige, Ilya Schwartz, Matthew D. Stewart, Iain Thaler, Jesse |
| author_sort | Feige, Ilya |
| collection | MIT |
| description | Jet substructure has emerged as a critical tool for LHC searches, but studies so far have relied heavily on shower Monte Carlo simulations, which formally approximate QCD at the leading-log level. We demonstrate that systematic higher-order QCD computations of jet substructure can be carried out by boosting global event shapes by a large momentum Q and accounting for effects due to finite jet size, initial-state radiation (ISR), and the underlying event (UE) as 1/Q corrections. In particular, we compute the 2-subjettiness substructure distribution for boosted Z→q[bar over q] events at the LHC at next-to-next-to-next-to-leading-log order. The calculation is greatly simplified by recycling known results for the thrust distribution in e[superscript +]e[superscript -] collisions. The 2-subjettiness distribution quickly saturates, becoming Q independent for Q≳400 GeV. Crucially, the effects of jet contamination from ISR/UE can be subtracted out analytically at large Q without knowing their detailed form. Amusingly, the Q=∞ and Q=0 distributions are related by a scaling by e up to next-to-leading-log order. |
| first_indexed | 2024-09-23T08:04:50Z |
| format | Article |
| id | mit-1721.1/73879 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T08:04:50Z |
| publishDate | 2012 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/738792022-09-30T07:21:04Z Precision Jet Substructure from Boosted Event Shapes Feige, Ilya Schwartz, Matthew D. Stewart, Iain Thaler, Jesse Massachusetts Institute of Technology. Department of Physics Stewart, Iain Thaler, Jesse Jet substructure has emerged as a critical tool for LHC searches, but studies so far have relied heavily on shower Monte Carlo simulations, which formally approximate QCD at the leading-log level. We demonstrate that systematic higher-order QCD computations of jet substructure can be carried out by boosting global event shapes by a large momentum Q and accounting for effects due to finite jet size, initial-state radiation (ISR), and the underlying event (UE) as 1/Q corrections. In particular, we compute the 2-subjettiness substructure distribution for boosted Z→q[bar over q] events at the LHC at next-to-next-to-next-to-leading-log order. The calculation is greatly simplified by recycling known results for the thrust distribution in e[superscript +]e[superscript -] collisions. The 2-subjettiness distribution quickly saturates, becoming Q independent for Q≳400 GeV. Crucially, the effects of jet contamination from ISR/UE can be subtracted out analytically at large Q without knowing their detailed form. Amusingly, the Q=∞ and Q=0 distributions are related by a scaling by e up to next-to-leading-log order. United States. Dept. of Energy (Contract DE-FG02-94ER40818) United States. Dept. of Energy (Contract DE-FG02-05ER-41360) United States. Dept. of Energy (Contract DE-FG02-11ER-41741) United States. Dept. of Energy (Contract DE-SC003916) 2012-10-11T15:59:11Z 2012-10-11T15:59:11Z 2012-08 2012-04 Article http://purl.org/eprint/type/JournalArticle 0031-9007 1079-7114 http://hdl.handle.net/1721.1/73879 Feige, Ilya et al. “Precision Jet Substructure from Boosted Event Shapes.” Physical Review Letters 109.9 (2012). © 2012 American Physical Society https://orcid.org/0000-0002-2406-8160 https://orcid.org/0000-0003-0248-0979 en_US http://dx.doi.org/10.1103/PhysRevLett.109.092001 Physical Review Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | Feige, Ilya Schwartz, Matthew D. Stewart, Iain Thaler, Jesse Precision Jet Substructure from Boosted Event Shapes |
| title | Precision Jet Substructure from Boosted Event Shapes |
| title_full | Precision Jet Substructure from Boosted Event Shapes |
| title_fullStr | Precision Jet Substructure from Boosted Event Shapes |
| title_full_unstemmed | Precision Jet Substructure from Boosted Event Shapes |
| title_short | Precision Jet Substructure from Boosted Event Shapes |
| title_sort | precision jet substructure from boosted event shapes |
| url | http://hdl.handle.net/1721.1/73879 https://orcid.org/0000-0002-2406-8160 https://orcid.org/0000-0003-0248-0979 |
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