XCone: N-jettiness as an exclusive cone jet algorithm
We introduce a new jet algorithm called XCone, for eXclusive Cone, which is based on minimizing the event shape N -jettiness. Because N -jettiness partitions every event into N jet regions and a beam region, XCone is an exclusive jet algorithm that always returns a fixed number of jets. We use a new...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Springer Berlin Heidelberg
2016
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| Online Access: | http://hdl.handle.net/1721.1/103395 https://orcid.org/0000-0002-2406-8160 https://orcid.org/0000-0003-0248-0979 |
| _version_ | 1826215458474295296 |
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| author | Thaler, Jesse Tackmann, Frank J. Vermilion, Christopher K. Wilkason, Thomas F. Stewart, Iain |
| author2 | Massachusetts Institute of Technology. Center for Theoretical Physics |
| author_facet | Massachusetts Institute of Technology. Center for Theoretical Physics Thaler, Jesse Tackmann, Frank J. Vermilion, Christopher K. Wilkason, Thomas F. Stewart, Iain |
| author_sort | Thaler, Jesse |
| collection | MIT |
| description | We introduce a new jet algorithm called XCone, for eXclusive Cone, which is based on minimizing the event shape N -jettiness. Because N -jettiness partitions every event into N jet regions and a beam region, XCone is an exclusive jet algorithm that always returns a fixed number of jets. We use a new “conical geometric” measure for which well-separated jets are bounded by circles of radius R in the rapidity-azimuth plane, while overlapping jet regions automatically form nearest-neighbor “clover jets”. This avoids the split/merge criteria needed in inclusive cone algorithms. A key feature of XCone is that it smoothly transitions between the resolved regime where the N signal jets of interest are well separated and the boosted regime where they overlap. The returned value of N -jettiness also provides a quality criterion of how N -jet-like the event looks. We also discuss the N -jettiness factorization theorems that occur for various jet measures, which can be used to compute the associated exclusive N -jet cross sections. In a companion paper [1], the physics potential of XCone is demonstrated using the examples of dijet resonances, Higgs decays to bottom quarks, and all-hadronic top pairs. |
| first_indexed | 2024-09-23T16:29:58Z |
| format | Article |
| id | mit-1721.1/103395 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T16:29:58Z |
| publishDate | 2016 |
| publisher | Springer Berlin Heidelberg |
| record_format | dspace |
| spelling | mit-1721.1/1033952022-09-29T20:01:25Z XCone: N-jettiness as an exclusive cone jet algorithm Thaler, Jesse Tackmann, Frank J. Vermilion, Christopher K. Wilkason, Thomas F. Stewart, Iain Massachusetts Institute of Technology. Center for Theoretical Physics Massachusetts Institute of Technology. Department of Physics Stewart, Iain Thaler, Jesse Wilkason, Thomas F. We introduce a new jet algorithm called XCone, for eXclusive Cone, which is based on minimizing the event shape N -jettiness. Because N -jettiness partitions every event into N jet regions and a beam region, XCone is an exclusive jet algorithm that always returns a fixed number of jets. We use a new “conical geometric” measure for which well-separated jets are bounded by circles of radius R in the rapidity-azimuth plane, while overlapping jet regions automatically form nearest-neighbor “clover jets”. This avoids the split/merge criteria needed in inclusive cone algorithms. A key feature of XCone is that it smoothly transitions between the resolved regime where the N signal jets of interest are well separated and the boosted regime where they overlap. The returned value of N -jettiness also provides a quality criterion of how N -jet-like the event looks. We also discuss the N -jettiness factorization theorems that occur for various jet measures, which can be used to compute the associated exclusive N -jet cross sections. In a companion paper [1], the physics potential of XCone is demonstrated using the examples of dijet resonances, Higgs decays to bottom quarks, and all-hadronic top pairs. United States. Department of Energy (Offices of Nuclear and Particle Physics Contracts DE-SC00012567 and DE-SC0011090) Simons Foundation (Investigator grant 327942) United States. Department of Energy (Early Career research program DE-SC0006389) Alfred P. Sloan Foundation (Sloan Research Fellowship) Massachusetts Institute of Technology. Undergraduate Research Opportunities Program (Paul E. Gray Endowed Fund) 2016-06-30T19:44:02Z 2016-06-30T19:44:02Z 2015-11 2015-09 2016-05-23T09:37:29Z Article http://purl.org/eprint/type/JournalArticle 1029-8479 1126-6708 http://hdl.handle.net/1721.1/103395 Stewart, Iain W. et al. “XCone: N-Jettiness as an Exclusive Cone Jet Algorithm.” Journal of High Energy Physics 2015.11 (2015): n. pag. https://orcid.org/0000-0002-2406-8160 https://orcid.org/0000-0003-0248-0979 en http://dx.doi.org/10.1007/JHEP11(2015)072 Journal of High Energy Physics Creative Commons Attribution http://creativecommons.org/licenses/by/4.0/ The Author(s) application/pdf Springer Berlin Heidelberg Springer Berlin Heidelberg |
| spellingShingle | Thaler, Jesse Tackmann, Frank J. Vermilion, Christopher K. Wilkason, Thomas F. Stewart, Iain XCone: N-jettiness as an exclusive cone jet algorithm |
| title | XCone: N-jettiness as an exclusive cone jet algorithm |
| title_full | XCone: N-jettiness as an exclusive cone jet algorithm |
| title_fullStr | XCone: N-jettiness as an exclusive cone jet algorithm |
| title_full_unstemmed | XCone: N-jettiness as an exclusive cone jet algorithm |
| title_short | XCone: N-jettiness as an exclusive cone jet algorithm |
| title_sort | xcone n jettiness as an exclusive cone jet algorithm |
| url | http://hdl.handle.net/1721.1/103395 https://orcid.org/0000-0002-2406-8160 https://orcid.org/0000-0003-0248-0979 |
| work_keys_str_mv | AT thalerjesse xconenjettinessasanexclusiveconejetalgorithm AT tackmannfrankj xconenjettinessasanexclusiveconejetalgorithm AT vermilionchristopherk xconenjettinessasanexclusiveconejetalgorithm AT wilkasonthomasf xconenjettinessasanexclusiveconejetalgorithm AT stewartiain xconenjettinessasanexclusiveconejetalgorithm |