Observation of single top quark production and measurement of |Vtb| with CDF
We report the observation of electroweak single top quark production in 3.2 fb-1 [fb superscript -1] of pp̅ collision data collected by the Collider Detector at Fermilab at √s=1.96 TeV [square root of s=1.96 TeV]. Candidate events in the W+jets topology with a leptonically decaying W boson are cla...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2011
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| Online Access: | http://hdl.handle.net/1721.1/62566 https://orcid.org/0000-0002-6047-4211 |
| _version_ | 1811074401478639616 |
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| author | Gomez-Ceballos, Guillelmo Goncharov, Maxim Makhoul, Khaldoun Paus, Christoph M. E. Bauer, Gerry P |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Gomez-Ceballos, Guillelmo Goncharov, Maxim Makhoul, Khaldoun Paus, Christoph M. E. Bauer, Gerry P |
| author_sort | Gomez-Ceballos, Guillelmo |
| collection | MIT |
| description | We report the observation of electroweak single top quark production in 3.2 fb-1 [fb superscript -1] of pp̅ collision data collected by the Collider Detector at Fermilab at √s=1.96 TeV [square root of s=1.96 TeV]. Candidate events in the W+jets topology with a leptonically decaying W boson are classified as signal-like by four parallel analyses based on likelihood functions, matrix elements, neural networks, and boosted decision trees. These results are combined using a super discriminant analysis based on genetically evolved neural networks in order to improve the sensitivity. This combined result is further combined with that of a search for a single top quark signal in an orthogonal sample of events with missing transverse energy plus jets and no charged lepton. We observe a signal consistent with the standard model prediction but inconsistent with the background-only model by 5.0 standard deviations, with a median expected sensitivity in excess of 5.9 standard deviations. We measure a production cross section of 2.3-0.5+0.6(stat+sys) [2.3 subscript -0.5 superscript +0.6 (stat + sys)] pb, extract the value of the Cabibbo-Kobayashi-Maskawa matrix element |Vtb|=0.91-0.11+0.11(stat+sys)±0.07 [|V subscript tb|=0.91 subscript -0.11 superscript +0.11 (stat + sys)±0.07] (theory), and set a lower limit |Vtb|>0.71 [|V subscript tb|>0.71] at the 95% C.L., assuming mt=175 [m subscript t =175] GeV/c2 [GeV / c superscript 2]. |
| first_indexed | 2024-09-23T09:48:53Z |
| format | Article |
| id | mit-1721.1/62566 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T09:48:53Z |
| publishDate | 2011 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/625662023-02-26T08:03:52Z Observation of single top quark production and measurement of |Vtb| with CDF Observation of single top quark production and measurement of |V subscript tb| with CDF Gomez-Ceballos, Guillelmo Goncharov, Maxim Makhoul, Khaldoun Paus, Christoph M. E. Bauer, Gerry P Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Paus, Christoph M. E. Bauer, Gerry P. Gomez-Ceballos, Guillelmo Goncharov, Maxim Makhoul, Khaldoun Paus, Christoph M. E. We report the observation of electroweak single top quark production in 3.2 fb-1 [fb superscript -1] of pp̅ collision data collected by the Collider Detector at Fermilab at √s=1.96 TeV [square root of s=1.96 TeV]. Candidate events in the W+jets topology with a leptonically decaying W boson are classified as signal-like by four parallel analyses based on likelihood functions, matrix elements, neural networks, and boosted decision trees. These results are combined using a super discriminant analysis based on genetically evolved neural networks in order to improve the sensitivity. This combined result is further combined with that of a search for a single top quark signal in an orthogonal sample of events with missing transverse energy plus jets and no charged lepton. We observe a signal consistent with the standard model prediction but inconsistent with the background-only model by 5.0 standard deviations, with a median expected sensitivity in excess of 5.9 standard deviations. We measure a production cross section of 2.3-0.5+0.6(stat+sys) [2.3 subscript -0.5 superscript +0.6 (stat + sys)] pb, extract the value of the Cabibbo-Kobayashi-Maskawa matrix element |Vtb|=0.91-0.11+0.11(stat+sys)±0.07 [|V subscript tb|=0.91 subscript -0.11 superscript +0.11 (stat + sys)±0.07] (theory), and set a lower limit |Vtb|>0.71 [|V subscript tb|>0.71] at the 95% C.L., assuming mt=175 [m subscript t =175] GeV/c2 [GeV / c superscript 2]. United States. Dept. of Energy National Science Foundation (U.S.) Alfred P. Sloan Foundation 2011-04-28T21:55:00Z 2011-04-28T21:55:00Z 2010-12 2010-04 Article http://purl.org/eprint/type/JournalArticle 1550-7998 1550-2368 http://hdl.handle.net/1721.1/62566 Aaltonen, T. et al. “Observation of Single Top Quark Production and Measurement of |V_{tb}| with CDF.” Physical Review D 82.11 (2010) © 2010 The American Physical Society https://orcid.org/0000-0002-6047-4211 en_US http://dx.doi.org/10.1103/PhysRevD.82.112005 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 | Gomez-Ceballos, Guillelmo Goncharov, Maxim Makhoul, Khaldoun Paus, Christoph M. E. Bauer, Gerry P Observation of single top quark production and measurement of |Vtb| with CDF |
| title | Observation of single top quark production and measurement of |Vtb| with CDF |
| title_full | Observation of single top quark production and measurement of |Vtb| with CDF |
| title_fullStr | Observation of single top quark production and measurement of |Vtb| with CDF |
| title_full_unstemmed | Observation of single top quark production and measurement of |Vtb| with CDF |
| title_short | Observation of single top quark production and measurement of |Vtb| with CDF |
| title_sort | observation of single top quark production and measurement of vtb with cdf |
| url | http://hdl.handle.net/1721.1/62566 https://orcid.org/0000-0002-6047-4211 |
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