Evidence for the associated production of a W boson and a top quark in ATLAS at √s = 7 TeV
This Letter presents evidence for the associated production of a W boson and a top quark using 2.05 fb[superscript −1] of pp collision data at √s = 7 TeV accumulated with the ATLAS detector at the LHC. The analysis is based on the selection of the dileptonic final states with events featuring two...
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| Format: | Article |
| Language: | en_US |
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Elsevier
2014
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| Online Access: | http://hdl.handle.net/1721.1/91970 https://orcid.org/0000-0002-7586-7253 |
| _version_ | 1811079749720604672 |
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| author | Taylor, Frank E. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Taylor, Frank E. |
| author_sort | Taylor, Frank E. |
| collection | MIT |
| description | This Letter presents evidence for the associated production of a W boson and a top quark using 2.05 fb[superscript −1] of pp collision data at √s = 7 TeV accumulated with the ATLAS detector at the LHC. The analysis is based on the selection of the dileptonic final states with events featuring two isolated leptons, electron or muon, with significant transverse missing momentum and at least one jet. An approach based on boosted decision trees has been developed to improve the discrimination of single top-quark Wt events from background. A template fit to the final classifier distributions is performed to determine the cross-section. The result is incompatible with the background-only hypothesis at the 3.3σ level, the expected sensitivity assuming the Standard Model production rate being 3.4σ. The corresponding cross-section is determined and found to be σ[subscript Wt]=16.8±2.9 (stat)±4.9 (syst) pb, in good agreement with the Standard Model expectation. From this result the CKM matrix element |V[subscript tb]| = 1.03[[subscript −0.19][superscript +0.16]] is derived assuming that the Wt production through |V[subscript ts]| and |V[subscript td]| is small. |
| first_indexed | 2024-09-23T11:19:56Z |
| format | Article |
| id | mit-1721.1/91970 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T11:19:56Z |
| publishDate | 2014 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | mit-1721.1/919702022-09-27T18:47:08Z Evidence for the associated production of a W boson and a top quark in ATLAS at √s = 7 TeV Taylor, Frank E. Massachusetts Institute of Technology. Department of Physics Taylor, Frank E. This Letter presents evidence for the associated production of a W boson and a top quark using 2.05 fb[superscript −1] of pp collision data at √s = 7 TeV accumulated with the ATLAS detector at the LHC. The analysis is based on the selection of the dileptonic final states with events featuring two isolated leptons, electron or muon, with significant transverse missing momentum and at least one jet. An approach based on boosted decision trees has been developed to improve the discrimination of single top-quark Wt events from background. A template fit to the final classifier distributions is performed to determine the cross-section. The result is incompatible with the background-only hypothesis at the 3.3σ level, the expected sensitivity assuming the Standard Model production rate being 3.4σ. The corresponding cross-section is determined and found to be σ[subscript Wt]=16.8±2.9 (stat)±4.9 (syst) pb, in good agreement with the Standard Model expectation. From this result the CKM matrix element |V[subscript tb]| = 1.03[[subscript −0.19][superscript +0.16]] is derived assuming that the Wt production through |V[subscript ts]| and |V[subscript td]| is small. European Organization for Nuclear Research United States. Dept. of Energy National Science Foundation (U.S.) Brookhaven National Laboratory 2014-12-01T19:24:55Z 2014-12-01T19:24:55Z 2012-08 2012-07 Article http://purl.org/eprint/type/JournalArticle 03702693 http://hdl.handle.net/1721.1/91970 Aad, G., B. Abbott, J. Abdallah, S. Abdel Khalek, A.A. Abdelalim, O. Abdinov, B. Abi, et al. “Evidence for the Associated Production of a W Boson and a Top Quark in ATLAS At √s = 7 TeV” Physics Letters B 716, no. 1 (September 2012): 142–159. © 2012 CERN https://orcid.org/0000-0002-7586-7253 en_US http://dx.doi.org/10.1016/j.physletb.2012.08.011 Physics Letters B Creative Commons Attribution http://creativecommons.org/licenses/by/3.0/ application/pdf Elsevier Elsevier |
| spellingShingle | Taylor, Frank E. Evidence for the associated production of a W boson and a top quark in ATLAS at √s = 7 TeV |
| title | Evidence for the associated production of a W boson and a top quark in ATLAS at √s = 7 TeV |
| title_full | Evidence for the associated production of a W boson and a top quark in ATLAS at √s = 7 TeV |
| title_fullStr | Evidence for the associated production of a W boson and a top quark in ATLAS at √s = 7 TeV |
| title_full_unstemmed | Evidence for the associated production of a W boson and a top quark in ATLAS at √s = 7 TeV |
| title_short | Evidence for the associated production of a W boson and a top quark in ATLAS at √s = 7 TeV |
| title_sort | evidence for the associated production of a w boson and a top quark in atlas at √s 7 tev |
| url | http://hdl.handle.net/1721.1/91970 https://orcid.org/0000-0002-7586-7253 |
| work_keys_str_mv | AT taylorfranke evidencefortheassociatedproductionofawbosonandatopquarkinatlasats7tev |