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    Rights statement: © 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 (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3.

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

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<mark>Journal publication date</mark>10/05/2016
<mark>Journal</mark>Physics Letters B
Volume756
Number of pages19
Pages (from-to)228-246
<mark>State</mark>Published
<mark>Original language</mark>English

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 σs = 4.8 ± 0.8(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.