ATLAS, Collaboration; Agustoni, Marco; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Haug, Sigve; Kabana, Sonja; Marti, Lukas; Meloni, Federico; Pretzl, Klaus-Peter; Schneider, Basil; Stramaglia, Maria Elena; Stucci, Stefania; Weber, Michael (2015). Search for s-channel single top-quark production in proton-proton collisions at √s=8 TeV with the ATLAS detector. Physics letters. B, 740, pp. 118-136. Elsevier 10.1016/j.physletb.2014.11.042
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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 σ s =5.0± 4.3 pb, consistent with the Standard Model expectation.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC) 08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP) |
UniBE Contributor: |
Agustoni, Marco, Beck, Hans Peter, Cervelli, Alberto, Ereditato, Antonio, Haug, Sigve, Marti, Lukas, Meloni, Federico, Pretzl, Klaus-Peter, Schneider, Basil, Stramaglia, Maria Elena, Stucci, Stefania, Weber, Michele |
Subjects: |
500 Science > 530 Physics |
ISSN: |
0370-2693 |
Publisher: |
Elsevier |
Language: |
English |
Submitter: |
Annette Krebs-Wegenast |
Date Deposited: |
12 Sep 2016 11:56 |
Last Modified: |
05 Dec 2022 14:58 |
Publisher DOI: |
10.1016/j.physletb.2014.11.042 |
ArXiv ID: |
1410.0647 |
Additional Information: |
Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt |
BORIS DOI: |
10.7892/boris.87686 |
URI: |
https://boris.unibe.ch/id/eprint/87686 |
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