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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

Aad, G.
•
Abbott, B.
•
Abdallah, J.
altro
GIORDANI, Mario
2016
  • journal article

Periodico
PHYSICS LETTERS. SECTION B
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.)-1.3+1.6(syst.) pb, which is consistent with the Standard Model expectation. The expected significance for the analysis is 3.9 standard deviations.
DOI
10.1016/j.physletb.2016.03.017
WOS
WOS:000373569200035
Archivio
http://hdl.handle.net/11390/1109766
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85042024827
Diritti
metadata only access
Scopus© citazioni
56
Data di acquisizione
Jun 2, 2022
Vedi dettagli
Web of Science© citazioni
49
Data di acquisizione
Mar 9, 2024
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