期刊
PHYSICS LETTERS B
卷 756, 期 -, 页码 228-246出版社
ELSEVIER
DOI: 10.1016/j.physletb.2016.03.017
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- ANPCyT, Argentina
- YerPhI, Armenia
- ARC, Australia
- BMWFW, Austria
- FWF, Austria
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- SSTC, Belarus
- CNPq, Brazil
- FAPESP, Brazil
- NSERC, Canada
- NRC, Canada
- CFI, Canada
- CERN
- CONICYT, Chile
- CAS, China
- MOST, China
- NSFC, China
- COLCIENCIAS, Colombia
- MSMT CR, Czech Republic
- MPO CR, Czech Republic
- VSC CR, Czech Republic
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- DNSRC, Denmark
- Lundbeck Foundation, Denmark
- IN2P3-CNRS, France
- CEA-DSM/IRFU, France
- GNSF, Georgia
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- HGF, Germany
- MPG, Germany
- GSRT, Greece
- RGC, China
- Hong Kong SAR, China
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- I-CORE, Israel
- Benoziyo Center, Israel
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- NWO, Netherlands
- RCN, Norway
- MNiSW, Poland
- NCN, Poland
- FCT, Portugal
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- MES of Russia, Russian Federation
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- Wallenberg Foundation, Sweden
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- Cantons of Bern, Switzerland
- Geneva, Switzerland
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- DOE
- NSF
- United States of America
- BCKDF, Canada
- Canada Council, Canada
- CANARIE, Canada
- CRC, Canada
- Compute Canada, Canada
- FQRNT, Canada
- Ontario Innovation Trust, Canada
- EPLANET, European Union
- ERC, European Union
- FP7, European Union
- Horizon 2020, European Union
- Marie Sklodowska-Curie Actions, European Union
- Investissements d'Avenir Labex and Idex, France
- ANR, France
- Region Auvergne, France
- Fondation Partager le Savoir, France
- DFG, Germany
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- Herakleitos
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- Greek NSRF
- BSF, Israel
- GIF, Israel
- Minerva, Israel
- BRF, Norway
- Royal Society, United Kingdom
- Leverhulme Trust, United Kingdom
- STFC [ST/N000463/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/L001209/1 ATLAS Upgrades, ST/M007103/1 ATLAS Upgrades, ST/M002071/1 ATLAS Upgrades, 1366825, ST/N000463/1, GRIDPP, PP/E000444/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien
- Division Of Physics [1119200] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1506173, 1410972] Funding Source: National Science Foundation
- ICREA Funding Source: Custom
This Letter presents evidence for single top-quark production in the s-channel using proton-proton collisions at a centre-of-mass energy of 8 TeV with the ATLAS detector at the CERN Large Hadron Collider. The analysis is performed on events containing one isolated electron or muon, large missing transverse momentum and exactly two b-tagged jets in the final state. The analysed data set corresponds to an integrated luminosity of 20.3 fb(-1). The signal is extracted using a maximum-likelihood fit of a discriminant which is based on the matrix element method and optimized in order to separate single-top-quark s-channel events from the main background contributions, which are top-quark pair production and W boson production in association with heavy-flavour jets. The measurement leads to an observed signal significance of 3.2 standard deviations and a measured cross-section of sigma s = 4.8 +/- 0.8(stat.)(-1.3)(+1.6)(syst.) pb, which is consistent with the Standard Model expectation. The expected significance for the analysis is 3.9 standard deviations. (C) 2016 CERN for the benefit of the ATLAS Collaboration. Published by Elsevier B.V. This is an open access article under the CC BY license.
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