Search for new physics in the mumu+e/mu+EslashT channel with a low-pT lepton threshold at the Collider Detector at Fermilab
A search for new physics using three-lepton (trilepton) data collected with the CDF II detector and corresponding to an integrated luminosity of 976 pb[superscript -1] is presented. The standard model predicts a low rate of trilepton events, which makes some supersymmetric processes, such as chargin...
| Main Authors: | , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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American Physical Society
2010
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| Online Access: | http://hdl.handle.net/1721.1/52309 https://orcid.org/0000-0002-6047-4211 |
| _version_ | 1811075178482892800 |
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| author | Xie, Si Knuteson, Bruce O. Henderson, C. Hahn, Kristian Allan Gomez-Ceballos, Guillelmo Choudalakis, Georgios Paus, Christoph M. E. Makhoul, Khaldoun Bauer, Gerry P |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Xie, Si Knuteson, Bruce O. Henderson, C. Hahn, Kristian Allan Gomez-Ceballos, Guillelmo Choudalakis, Georgios Paus, Christoph M. E. Makhoul, Khaldoun Bauer, Gerry P |
| author_sort | Xie, Si |
| collection | MIT |
| description | A search for new physics using three-lepton (trilepton) data collected with the CDF II detector and corresponding to an integrated luminosity of 976 pb[superscript -1] is presented. The standard model predicts a low rate of trilepton events, which makes some supersymmetric processes, such as chargino-neutralino production, measurable in this channel. The μμ+ℓ signature is investigated, where ℓ is an electron or a muon, with the additional requirement of large missing transverse energy. In this analysis, the lepton transverse momenta with respect to the beam direction (p[subscript T]) are as low as 5 GeV/c, a selection that improves the sensitivity to particles that are light as well as to ones that result in leptonically decaying tau leptons. At the same time, this low-p[subscript T] selection presents additional challenges due to the non-negligible heavy-quark background at low lepton momenta. This background is measured with an innovative technique using experimental data. Several dimuon and trilepton control regions are investigated, and good agreement between experimental results and standard-model predictions is observed. In the signal region, we observe one three-muon event and expect 0.4±0.1 μμ+ℓ events from standard-model processes. |
| first_indexed | 2024-09-23T10:02:04Z |
| format | Article |
| id | mit-1721.1/52309 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:02:04Z |
| publishDate | 2010 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/523092023-02-26T10:41:27Z Search for new physics in the mumu+e/mu+EslashT channel with a low-pT lepton threshold at the Collider Detector at Fermilab Search for new physics in the μμ+e/μ+E̸T channel with a low-pT lepton threshold at the Collider Detector at Fermilab Xie, Si Knuteson, Bruce O. Henderson, C. Hahn, Kristian Allan Gomez-Ceballos, Guillelmo Choudalakis, Georgios Paus, Christoph M. E. Makhoul, Khaldoun Bauer, Gerry P Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Paus, Christoph M. E. Xie, Si Makhoul, K. Knuteson, Bruce O. Henderson, C. Hahn, Kristian Allan Gomez-Ceballos, Guillelmo Choudalakis, Georgios Bauer, Gerry P. Paus, Christoph M. E. A search for new physics using three-lepton (trilepton) data collected with the CDF II detector and corresponding to an integrated luminosity of 976 pb[superscript -1] is presented. The standard model predicts a low rate of trilepton events, which makes some supersymmetric processes, such as chargino-neutralino production, measurable in this channel. The μμ+ℓ signature is investigated, where ℓ is an electron or a muon, with the additional requirement of large missing transverse energy. In this analysis, the lepton transverse momenta with respect to the beam direction (p[subscript T]) are as low as 5 GeV/c, a selection that improves the sensitivity to particles that are light as well as to ones that result in leptonically decaying tau leptons. At the same time, this low-p[subscript T] selection presents additional challenges due to the non-negligible heavy-quark background at low lepton momenta. This background is measured with an innovative technique using experimental data. Several dimuon and trilepton control regions are investigated, and good agreement between experimental results and standard-model predictions is observed. In the signal region, we observe one three-muon event and expect 0.4±0.1 μμ+ℓ events from standard-model processes. Academy of Finland Slovak R&D Agency Programa Consolider-Ingenio 2010, Spain Ministerio de Ciencia e Innovación, Spain Russian Foundation for Basic Research Institut National de Physique Nucleaire et Physique des Particules/CNRS Royal Society, United Kingdom Science and Technology Facilities Council, United Kingdom Korean Research Foundation Korean Science and Engineering Foundation Bundesministerium für Bildung und Forschung, Germany Alfred P. Sloan Foundation Swiss National Science Foundation National Science Council of the Republic of China Natural Sciences and Engineering Research Council of Canada Ministry of Education, Culture, Sports, Science and Technology of Japan Italian Istituto Nazionale di Fisica Nucleare National Science Foundation United States Department of Energy 2010-03-04T19:37:16Z 2010-03-04T19:37:16Z 2009-03 2008-10 Article http://purl.org/eprint/type/JournalArticle 1550-2368 1550-7998 http://hdl.handle.net/1721.1/52309 CDF Collaboration et al. “Search for new physics in the mumu+e/mu+EslashT channel with a low-pT lepton threshold at the Collider Detector at Fermilab.” Physical Review D 79.5 (2009): 052004. 2009 The American Physical Society https://orcid.org/0000-0002-6047-4211 en_US http://dx.doi.org/10.1103/PhysRevD.79.052004 Physical Review D 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 | Xie, Si Knuteson, Bruce O. Henderson, C. Hahn, Kristian Allan Gomez-Ceballos, Guillelmo Choudalakis, Georgios Paus, Christoph M. E. Makhoul, Khaldoun Bauer, Gerry P Search for new physics in the mumu+e/mu+EslashT channel with a low-pT lepton threshold at the Collider Detector at Fermilab |
| title | Search for new physics in the mumu+e/mu+EslashT channel with a low-pT lepton threshold at the Collider Detector at Fermilab |
| title_full | Search for new physics in the mumu+e/mu+EslashT channel with a low-pT lepton threshold at the Collider Detector at Fermilab |
| title_fullStr | Search for new physics in the mumu+e/mu+EslashT channel with a low-pT lepton threshold at the Collider Detector at Fermilab |
| title_full_unstemmed | Search for new physics in the mumu+e/mu+EslashT channel with a low-pT lepton threshold at the Collider Detector at Fermilab |
| title_short | Search for new physics in the mumu+e/mu+EslashT channel with a low-pT lepton threshold at the Collider Detector at Fermilab |
| title_sort | search for new physics in the mumu e mu eslasht channel with a low pt lepton threshold at the collider detector at fermilab |
| url | http://hdl.handle.net/1721.1/52309 https://orcid.org/0000-0002-6047-4211 |
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