Article
Search for s-channel single top-quark production in proton–proton collisions at s=8 TeV with the ATLAS detector
Physics Letters B, Elsevier, ISSN 1873-2445
Volume 740, 2015
DOI:10.1016/j.physletb.2014.11.042, Dimensions: pub.1033151740,
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- (2) University of Oklahoma, grid.266900.b
- (3) Institute of Physics, Academia Sinica, grid.482252.b
- (4) Laboratoire de l'Accélérateur Linéaire, grid.462450.1
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- (22) Departamento de Fisica Teorica y del Cosmos and CAFPE, Universidad de Granada, Granada (Spain), Portugal
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Description
This Letter presents a search at the LHC for s-channel single top-quark production in proton–proton collisions at a centre-of-mass energy of 8 TeV. The analyzed data set was recorded by the ATLAS detector and corresponds to an integrated luminosity of 20.3 fb−1. Selected events contain one charged lepton, large missing transverse momentum and exactly two b-tagged jets. A multivariate event classifier based on boosted decision trees is developed to discriminate s-channel single top-quark events from the main background contributions. The signal extraction is based on a binned maximum-likelihood fit of the output classifier distribution. The analysis leads to an upper limit on the s-channel single top-quark production cross-section of 14.6 pb at the 95% confidence level. The fit gives a cross-section of σs=5.0±4.3 pb, consistent with the Standard Model expectation.
Funders
- Ministry of Science and Technology of the People's Republic of China
- Australian Research Council
- Chinese Academy of Sciences
- Japan Society for the Promotion of Science
- National Research Council Canada
- Slovenian Research Agency
- Science and Technology Facilities Council
- Colciencias
- German Research Foundation
- Leverhulme Trust
- Agencia Nacional de Promoción Científica y Tecnológica
- French National Centre for Scientific Research
- European Research Council
- São Paulo Research Foundation
- Ministry of Economy, Industry and Competitiveness
- Federal Ministry of Education and Research
- Brain Research Foundation
- Human Growth Foundation
- Brookhaven National Laboratory
- Rosatom (Russia)
- European Commission
- Dutch Research Council
- Israeli Centers for Research Excellence
- FWF Austrian Science Fund
- Ministry of Education, Science and Sport
- Israel Science Foundation
- Ministry of Education, Culture, Sports, Science and Technology
- National Natural Science Foundation of China
- Ministry of Education Youth and Sports
- National Institute for Nuclear Physics
- Joint Institute for Nuclear Research
- Semiconductor Research Corporation
- Ministry of Science and Higher Education
- Comisión Nacional de Investigación Científica y Tecnológica
- Atomic Energy and Alternative Energies Commission
- National Science Center
- Natural Sciences and Engineering Research Council
- Foundation for Science and Technology
- Alexander von Humboldt Foundation
- Swiss National Science Foundation
- Turkish Atomic Energy Authority
- General Secretariat for Research and Technology
- Ministry of Science and Technology
- Federal Ministry of Science, Research and Economics
- United States Department of Energy
- Royal Society
- National Council for Scientific and Technological Development
- Canada Foundation for Innovation
- Canadian Armed Forces
- Danish National Research Foundation
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