Search for s-channel single top-quark production in proton–proton collisions at √s = 8 TeV with the ATLAS detector
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Aad-2015-Search for s-channel.pdf
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1.32 MB
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Adobe PDF
Checksum (MD5)
e9a9a8421e0ae9b5807b096732cda395
Author(s)
Taylor, Frank E.
Date Issued
November 2014
Journal
Physics Letters B
Publisher
Elsevier
Citation
“Search for s-Channel Single Top-Quark Production in Proton–proton Collisions at √s = 8 TeV with the ATLAS Detector.” Physics Letters B 740 (January 2015): 118–136.
Version
Final published version
Abstract
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[superscript −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 [subscript σs]=5.0±4.3 pb, consistent with the Standard Model expectation.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.1016/j.physletb.2014.11.042
