Evidence for single top-quark production in the <i>s</i>-channel in proton-proton collisions at √<i>s</i>=8 TeV with the ATLAS detector using the Matrix Element Method



Aad, G, Abbott, B, Abdallah, J, Abdinov, O, Aben, R, Abolins, M, AbouZeid, OS, Abramowicz, H, Abreu, H, Abreu, R
et al (show 2861 more authors) (2016) Evidence for single top-quark production in the <i>s</i>-channel in proton-proton collisions at √<i>s</i>=8 TeV with the ATLAS detector using the Matrix Element Method. PHYSICS LETTERS B, 756. pp. 228-246.

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Abstract

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 $\sigma_s=4.8\pm0.8$(stat.)$^{+1.6}_{-1.3}$(syst.) pb, which is consistent with the Standard Model expectation. The expected significance for the analysis is 3.9 standard deviations.

Item Type: Article
Additional Information: 16 pages plus author list + cover page (34 pages total), 4 figures, 2 tables, submitted to PLB. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2015-01/
Uncontrolled Keywords: hep-ex, hep-ex
Depositing User: Symplectic Admin
Date Deposited: 14 Mar 2017 10:35
Last Modified: 17 Oct 2023 03:05
DOI: 10.1016/j.physletb.2016.03.017
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3006014