N Jettiness: An Inclusive Event Shape to Veto Jets
Jet vetoes are essential in many analyses at the LHC and Tevatron. Typical signals have a specific number of hard jets or leptons, while backgrounds have additional jets. Vetoing undesired jets efficiently discriminates signal and background. For a sample with ≥N jets, the veto to give N energetic j...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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American Physical Society
2011
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| Online Access: | http://hdl.handle.net/1721.1/61337 https://orcid.org/0000-0003-0248-0979 |
| _version_ | 1826215014379290624 |
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| author | Tackmann, Frank Waalewijn, Wouter Jonathan Stewart, Iain W |
| author2 | Massachusetts Institute of Technology. Center for Theoretical Physics |
| author_facet | Massachusetts Institute of Technology. Center for Theoretical Physics Tackmann, Frank Waalewijn, Wouter Jonathan Stewart, Iain W |
| author_sort | Tackmann, Frank |
| collection | MIT |
| description | Jet vetoes are essential in many analyses at the LHC and Tevatron. Typical signals have a specific number of hard jets or leptons, while backgrounds have additional jets. Vetoing undesired jets efficiently discriminates signal and background. For a sample with ≥N jets, the veto to give N energetic jets defines an “exclusive” N-jet cross section. This strongly restricts the phase space and causes large double logarithms in perturbation theory that must be summed. Jet vetoes are typically implemented using jet algorithms, yielding complicated phase-space restrictions, and reliance on leading-log parton-shower Monte Carlo simulations. We introduce a global event shape “N jettiness” τN [tau subscript N], which is defined for events with N signal jets. Requiring τN [tau subscript N]≪1 constrains radiation between the signal jets and provides a theoretically well-controlled jet veto. N jettiness yields a factorization formula with inclusive jet and beam functions. |
| first_indexed | 2024-09-23T16:15:09Z |
| format | Article |
| id | mit-1721.1/61337 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:15:09Z |
| publishDate | 2011 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/613372023-02-26T10:49:57Z N Jettiness: An Inclusive Event Shape to Veto Jets Tackmann, Frank Waalewijn, Wouter Jonathan Stewart, Iain W Massachusetts Institute of Technology. Center for Theoretical Physics Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Stewart, Iain Stewart, Iain Tackmann, Frank Waalewijn, Wouter Jonathan Jet vetoes are essential in many analyses at the LHC and Tevatron. Typical signals have a specific number of hard jets or leptons, while backgrounds have additional jets. Vetoing undesired jets efficiently discriminates signal and background. For a sample with ≥N jets, the veto to give N energetic jets defines an “exclusive” N-jet cross section. This strongly restricts the phase space and causes large double logarithms in perturbation theory that must be summed. Jet vetoes are typically implemented using jet algorithms, yielding complicated phase-space restrictions, and reliance on leading-log parton-shower Monte Carlo simulations. We introduce a global event shape “N jettiness” τN [tau subscript N], which is defined for events with N signal jets. Requiring τN [tau subscript N]≪1 constrains radiation between the signal jets and provides a theoretically well-controlled jet veto. N jettiness yields a factorization formula with inclusive jet and beam functions. United States. Dept. of Energy. Office of Nuclear Physics (Grant no. DE-FG02-94ER40818) 2011-02-24T22:28:52Z 2011-02-24T22:28:52Z 2010-08 2010-05 Article http://purl.org/eprint/type/JournalArticle 0031-9007 http://hdl.handle.net/1721.1/61337 Stewart, Iain, Frank Tackmann, and Wouter Waalewijn. “N Jettiness: An Inclusive Event Shape to Veto Jets.” Physical Review Letters 105.9 (2010): n. pag. © 2010 The American Physical Society https://orcid.org/0000-0003-0248-0979 en_US http://dx.doi.org/10.1103/PhysRevLett.105.092002 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 | Tackmann, Frank Waalewijn, Wouter Jonathan Stewart, Iain W N Jettiness: An Inclusive Event Shape to Veto Jets |
| title | N Jettiness: An Inclusive Event Shape to Veto Jets |
| title_full | N Jettiness: An Inclusive Event Shape to Veto Jets |
| title_fullStr | N Jettiness: An Inclusive Event Shape to Veto Jets |
| title_full_unstemmed | N Jettiness: An Inclusive Event Shape to Veto Jets |
| title_short | N Jettiness: An Inclusive Event Shape to Veto Jets |
| title_sort | n jettiness an inclusive event shape to veto jets |
| url | http://hdl.handle.net/1721.1/61337 https://orcid.org/0000-0003-0248-0979 |
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