Evidence for Single Top-Quark Production in the S-Channel in Proton-Proton Collisions at √s̅ = 8 TeV with the ATLAS Detector Using the Matrix Element Method

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Evidence for Single Top-Quark Production in the S-Channel in Proton-Proton Collisions at √s̅ = 8 TeV with the ATLAS Detector Using the Matrix Element Method

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Title: Evidence for Single Top-Quark Production in the S-Channel in Proton-Proton Collisions at √s̅ = 8 TeV with the ATLAS Detector Using the Matrix Element Method
Author(s):
Aad, G.;
Abbott, B.;
Abdallah, J.;
Abdinov, O.;
Aben, R.;
Abolins, M.;
AbouZeid, O. S.;
Izen, Joseph M.;
Leyton, Michael;
Meirose, Bernhard;
Namasivayam, Harisankar;
Reeves, Kendall;
ATLAS Collaboration
Date Created: 2016-03-08
Item Type: article
Keywords: Show Keywords
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 σ_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.
Publisher: Elsevier Science Bv
ISSN: 0370-2693
Source: Physics Letters B
Link to Related Resource: http://dx.doi.org/10.1016/j.physletb.2016.03.017
Persistent Link: http://hdl.handle.net/10735.1/5575
Bibliographic Citation: Aad, G., B. Abbott, J. Abdallah, O. Abdinov, et al. 2016. "Evidence for single top-quark production in the s-channel in proton-proton collisions at √s̅ = 8 TeV with the ATLAS detector using the Matrix Element Method." Physics Letters B 756, doi:10.1016/j.physletb.2016.03.017
Terms of Use: CC BY 4.0 (Attribution)
©2016 CERN, for the ATLAS Collaboration

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CC BY 4.0 (Attribution) Except where otherwise noted, this item's license is described as CC BY 4.0 (Attribution)