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Evidence for single top-quark production in the s-channel in proton-proton collisions at root s=8 TeV with the ATLAS detector using the Matrix Element Method
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0003-3867-0336
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-0299-8236
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-8913-0981
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Number of Authors: 28712016 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 756, p. 228-246Article in journal (Refereed) Published
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Abstract [en]

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.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 756, p. 228-246
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Physical Sciences
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URN: urn:nbn:se:kth:diva-186877DOI: 10.1016/j.physletb.2016.03.017ISI: 000373569200035Scopus ID: 2-s2.0-85042024827OAI: oai:DiVA.org:kth-186877DiVA, id: diva2:928503
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QC 20160516 Author count: 2871

Available from: 2016-05-16 Created: 2016-05-16 Last updated: 2018-05-16Bibliographically approved

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Lund-Jensen, BengtSidebo, P. EdvinStrandberg, Jonas

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