Search for FCNC single top-quark production at √s = 7 TeV with the ATLAS detector
A search for the production of single top-quarks via flavour-changing neutral-currents is presented. Data collected with the ATLAS detector at a centre-of-mass energy of √s = 7 TeV, corresponding to an integrated luminosity of 2.05 fb[superscript −1], are used. Candidate events with a semileptonic t...
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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/1721.1/92027 https://orcid.org/0000-0002-7586-7253 |
| _version_ | 1826202283626463232 |
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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 | A search for the production of single top-quarks via flavour-changing neutral-currents is presented. Data collected with the ATLAS detector at a centre-of-mass energy of √s = 7 TeV, corresponding to an integrated luminosity of 2.05 fb[superscript −1], are used. Candidate events with a semileptonic top-quark decay signature are classified as signal- or background-like events by using several kinematic variables as input to a neural network. No signal is observed in the neural network output distribution and a Bayesian upper limit is placed on the production cross-section. The observed upper limit at 95% confidence level on the cross-section multiplied by the t→Wb branching fraction is measured to be σ[subscript qg→t]×B(t→Wb)<3.9 pb. This upper limit is converted using a model-independent approach into upper limits on the coupling strengths κ[subscript ugt]/Λ<6.9⋅10[superscript −3] TeV[superscript −1] and κ[subscript cgt]/Λ<1.6⋅10[superscript −2] TeV[superscript −1], where Λ is the new physics scale, and on the branching fractions B(t→ug)<5.7⋅10[superscript −5] and B(t→cg)<2.7⋅10[superscript −4]. |
| first_indexed | 2024-09-23T12:05:05Z |
| format | Article |
| id | mit-1721.1/92027 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:05:05Z |
| publishDate | 2014 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | mit-1721.1/920272022-10-01T08:01:26Z Search for FCNC single top-quark production at √s = 7 TeV with the ATLAS detector Taylor, Frank E. Massachusetts Institute of Technology. Department of Physics Taylor, Frank E. A search for the production of single top-quarks via flavour-changing neutral-currents is presented. Data collected with the ATLAS detector at a centre-of-mass energy of √s = 7 TeV, corresponding to an integrated luminosity of 2.05 fb[superscript −1], are used. Candidate events with a semileptonic top-quark decay signature are classified as signal- or background-like events by using several kinematic variables as input to a neural network. No signal is observed in the neural network output distribution and a Bayesian upper limit is placed on the production cross-section. The observed upper limit at 95% confidence level on the cross-section multiplied by the t→Wb branching fraction is measured to be σ[subscript qg→t]×B(t→Wb)<3.9 pb. This upper limit is converted using a model-independent approach into upper limits on the coupling strengths κ[subscript ugt]/Λ<6.9⋅10[superscript −3] TeV[superscript −1] and κ[subscript cgt]/Λ<1.6⋅10[superscript −2] TeV[superscript −1], where Λ is the new physics scale, and on the branching fractions B(t→ug)<5.7⋅10[superscript −5] and B(t→cg)<2.7⋅10[superscript −4]. European Organization for Nuclear Research United States. Dept. of Energy National Science Foundation (U.S.) Brookhaven National Laboratory 2014-12-03T19:12:44Z 2014-12-03T19:12:44Z 2012-05 2012-05 Article http://purl.org/eprint/type/JournalArticle 03702693 http://hdl.handle.net/1721.1/92027 Aad, G., B. Abbott, J. Abdallah, A.A. Abdelalim, A. Abdesselam, O. Abdinov, B. Abi, et al. “Search for FCNC Single Top-Quark Production at √s = 7 TeV with the ATLAS Detector.” Physics Letters B 712, no. 4–5 (June 2012): 351–369. © 2012 CERN https://orcid.org/0000-0002-7586-7253 en_US http://dx.doi.org/10.1016/j.physletb.2012.05.022 Physics Letters B Creative Commons Attribution http://creativecommons.org/licenses/by/3.0/ application/pdf Elsevier Elsevier |
| spellingShingle | Taylor, Frank E. Search for FCNC single top-quark production at √s = 7 TeV with the ATLAS detector |
| title | Search for FCNC single top-quark production at √s = 7 TeV with the ATLAS detector |
| title_full | Search for FCNC single top-quark production at √s = 7 TeV with the ATLAS detector |
| title_fullStr | Search for FCNC single top-quark production at √s = 7 TeV with the ATLAS detector |
| title_full_unstemmed | Search for FCNC single top-quark production at √s = 7 TeV with the ATLAS detector |
| title_short | Search for FCNC single top-quark production at √s = 7 TeV with the ATLAS detector |
| title_sort | search for fcnc single top quark production at √s 7 tev with the atlas detector |
| url | http://hdl.handle.net/1721.1/92027 https://orcid.org/0000-0002-7586-7253 |
| work_keys_str_mv | AT taylorfranke searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector |