Search for single top-quark production via flavour-changing neutral currents at 8 TeV with the ATLAS detector
A search for single top-quark production via flavour-changing neutral current processes from gluon plus up- or charm-quark initial states in proton–proton collisions at the LHC is presented. Data collected with the ATLAS detector in 2012 at a centre-of-mass energy of 8 TeV and corresponding to an in...
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| Format: | Article |
| Language: | en_US |
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Springer-Verlag
2017
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| Online Access: | http://hdl.handle.net/1721.1/106548 https://orcid.org/0000-0002-7586-7253 |
| _version_ | 1811084435901120512 |
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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 single top-quark production via flavour-changing neutral current processes from gluon plus up- or charm-quark initial states in proton–proton collisions at the LHC is presented. Data collected with the ATLAS detector in 2012 at a centre-of-mass energy of 8 TeV and corresponding to an integrated luminosity of 20.3 fb[superscript −1] are used. Candidate events for a top quark decaying into a lepton, a neutrino and a jet are selected and classified into signal- and background-like candidates using a neural network. No signal is observed and an upper limit on the production cross-section multiplied by the t→Wb branching fraction is set. The observed 95 % CL limit is σ[subscript qg→t]×B(t→Wb)<3.4 pb and the expected 95 % CL limit is σ[subscript qg]→t×B(t→Wb)<2.9 pb. The observed limit can be interpreted as upper limits on the coupling constants of the flavour-changing neutral current interactions divided by the scale of new physics κ[subscript ugt]/Λ<5.8×10[superscript −3] TeV[superscript −1] and κ[subscrip cgt]/Λ<13×10[superscript −3] TeV and on the branching fractions B(t→ug)<4.0×10[superscript −5] and B(t→cg)<20×10[superscript −5] . |
| first_indexed | 2024-09-23T12:50:41Z |
| format | Article |
| id | mit-1721.1/106548 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:50:41Z |
| publishDate | 2017 |
| publisher | Springer-Verlag |
| record_format | dspace |
| spelling | mit-1721.1/1065482022-09-28T10:25:12Z Search for single top-quark production via flavour-changing neutral currents at 8 TeV with the ATLAS detector Taylor, Frank E Massachusetts Institute of Technology. Department of Physics Taylor, Frank E A search for single top-quark production via flavour-changing neutral current processes from gluon plus up- or charm-quark initial states in proton–proton collisions at the LHC is presented. Data collected with the ATLAS detector in 2012 at a centre-of-mass energy of 8 TeV and corresponding to an integrated luminosity of 20.3 fb[superscript −1] are used. Candidate events for a top quark decaying into a lepton, a neutrino and a jet are selected and classified into signal- and background-like candidates using a neural network. No signal is observed and an upper limit on the production cross-section multiplied by the t→Wb branching fraction is set. The observed 95 % CL limit is σ[subscript qg→t]×B(t→Wb)<3.4 pb and the expected 95 % CL limit is σ[subscript qg]→t×B(t→Wb)<2.9 pb. The observed limit can be interpreted as upper limits on the coupling constants of the flavour-changing neutral current interactions divided by the scale of new physics κ[subscript ugt]/Λ<5.8×10[superscript −3] TeV[superscript −1] and κ[subscrip cgt]/Λ<13×10[superscript −3] TeV and on the branching fractions B(t→ug)<4.0×10[superscript −5] and B(t→cg)<20×10[superscript −5] . United States. Dept. of Energy National Science Foundation (U.S.) Brookhaven National Laboratory 2017-01-20T14:44:16Z 2017-01-20T14:44:16Z 2016-01 2015-09 Article http://purl.org/eprint/type/JournalArticle 1434-6044 1434-6052 http://hdl.handle.net/1721.1/106548 ATLAS Collaboration et al. “Search for Single Top-Quark Production via Flavour-Changing Neutral Currents at 8 TeV with the ATLAS Detector.” The European Physical Journal C 76.2 (2016): n. pag. © 2016 CERN for the benefit of the ATLAS collaboration https://orcid.org/0000-0002-7586-7253 en_US http://dx.doi.org/10.1140/epjc/s10052-016-3876-4 The European Physical Journal C Creative Commons Attribution 4.0 International License http://creativecommons.org/licenses/by/4.0/ application/pdf Springer-Verlag Springer |
| spellingShingle | Taylor, Frank E Search for single top-quark production via flavour-changing neutral currents at 8 TeV with the ATLAS detector |
| title | Search for single top-quark production via flavour-changing neutral currents at 8 TeV with the ATLAS detector |
| title_full | Search for single top-quark production via flavour-changing neutral currents at 8 TeV with the ATLAS detector |
| title_fullStr | Search for single top-quark production via flavour-changing neutral currents at 8 TeV with the ATLAS detector |
| title_full_unstemmed | Search for single top-quark production via flavour-changing neutral currents at 8 TeV with the ATLAS detector |
| title_short | Search for single top-quark production via flavour-changing neutral currents at 8 TeV with the ATLAS detector |
| title_sort | search for single top quark production via flavour changing neutral currents at 8 tev with the atlas detector |
| url | http://hdl.handle.net/1721.1/106548 https://orcid.org/0000-0002-7586-7253 |
| work_keys_str_mv | AT taylorfranke searchforsingletopquarkproductionviaflavourchangingneutralcurrentsat8tevwiththeatlasdetector |