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

ATLAS Collaboration

doi:10.1016/j.physletb.2016.03.017

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

ATLAS Collaboration

Aix-Marseille Université and CNRS/IN2P3
Homer L. Dodge Department of Physics and Astronomy
University of Oklahoma
Academia Sinica - Institute of Physics
Azerbaijan National Academy of Sciences
University of Amsterdam
Department of Physics and Astronomy
Michigan State University
Department of Physics
University of Toronto
Raymond and Beverly Sackler School of Physics and Astronomy
Tel Aviv University
Department of Physics
Technion-Israel Institute of Technology
Center for High Energy Physics
University of Oregon
Department of Physics
Stockholm University
The Oskar Klein Centre
INFN Gruppo Collegato di Udine
National Institute for Nuclear Physics
Abdus Salam International Centre for Theoretical Physics
Department of Physics
King's College London
Faculty of Physics and Applied Computer Science
AGH University of Krakow
Transilvania University of Brasov
Department of Physics
Northern Illinois University
Fakultät für Physik
Ludwig Maximilian University of Munich
Didcot
Oliver Lodge Laboratory
University of Liverpool
Institute of Physics
University of Belgrade
II Physikalisches Institut
University of Göttingen
Laboratório de Instrumentação e Física Experimental de Partículas
Departamento de Fisica Teorica y Del Cosmos
University of Granada
Dep Fisica
NOVA University Lisbon
Boston University
Joint Institute for Nuclear Research
Dipartimento di Fisica
University of Rome Tor Vergata
Fysiska institutionen
Lund University
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
Dipartimento di Fisica e Astronomia
University of Bologna
Department of Physics and Astronomy
University of Victoria BC
Université Grenoble Alpes
Instituto de Física La Plata
CERN
Horia Hulubei National Institute of Physics and Nuclear Engineering
Physics Department
National Technical University of Athens
The University of Chicago
Nevis Laboratory
Columbia University
Department of Physics and Astronomy
University of Sussex
School of Physics and Astronomy
University of Birmingham
Dipartimento di Fisica
University of Naples Federico II
University of Copenhagen
Department of Physics
University of Washington
Kobe University

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78 引用（Scopus）

摘要

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.

源语言	英语
页（从-至）	228-246
页数	19
期刊	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
卷	756
DOI	https://doi.org/10.1016/j.physletb.2016.03.017
出版状态	已出版 - 10 5月 2016
已对外发布	是

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@article{2d00c06517ca42b4876c9f9acecf7a8c,

title = "Evidence for single top-quark production in the s-channel in proton{\textendash}proton collisions at √s=8 TeV with the ATLAS detector using the Matrix Element Method",

abstract = "This Letter presents evidence for single top-quark production in the s-channel using proton{\textendash}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.",

author = "\{ATLAS Collaboration\} and G. Aad and B. Abbott and J. Abdallah and O. Abdinov and R. Aben and M. Abolins and AbouZeid, \{O. S.\} and H. Abramowicz and H. Abreu and R. Abreu and Y. Abulaiti and Acharya, \{B. S.\} and L. Adamczyk and Adams, \{D. L.\} and J. Adelman and S. Adomeit and T. Adye and Affolder, \{A. A.\} and T. Agatonovic-Jovin and J. Agricola and Aguilar-Saavedra, \{J. A.\} and Ahlen, \{S. P.\} and F. Ahmadov and G. Aielli and H. Akerstedt and {\AA}kesson, \{T. P.A.\} and Akimov, \{A. V.\} and Alberghi, \{G. L.\} and J. Albert and S. Albrand and \{Alconada Verzini\}, \{M. J.\} and M. Aleksa and Aleksandrov, \{I. N.\} and C. Alexa and G. Alexander and T. Alexopoulos and M. Alhroob and G. Alimonti and L. Alio and J. Alison and Alkire, \{S. P.\} and Allbrooke, \{B. M.M.\} and Allport, \{P. P.\} and A. Aloisio and A. Alonso and F. Alonso and C. Alpigiani and A. Altheimer and \{Alvarez Gonzalez\}, B. and L. Yuan",

note = "Publisher Copyright: {\textcopyright} 2016 CERN for the benefit of the ATLAS Collaboration",

year = "2016",

month = may,

day = "10",

doi = "10.1016/j.physletb.2016.03.017",

language = "英语",

volume = "756",

pages = "228--246",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - 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

AU - ATLAS Collaboration

AU - Aad, G.

AU - Abbott, B.

AU - Abdallah, J.

AU - Abdinov, O.

AU - Aben, R.

AU - Abolins, M.

AU - AbouZeid, O. S.

AU - Abramowicz, H.

AU - Abreu, H.

AU - Abreu, R.

AU - Abulaiti, Y.

AU - Acharya, B. S.

AU - Adamczyk, L.

AU - Adams, D. L.

AU - Adelman, J.

AU - Adomeit, S.

AU - Adye, T.

AU - Affolder, A. A.

AU - Agatonovic-Jovin, T.

AU - Agricola, J.

AU - Aguilar-Saavedra, J. A.

AU - Ahlen, S. P.

AU - Ahmadov, F.

AU - Aielli, G.

AU - Akerstedt, H.

AU - Åkesson, T. P.A.

AU - Akimov, A. V.

AU - Alberghi, G. L.

AU - Albert, J.

AU - Albrand, S.

AU - Alconada Verzini, M. J.

AU - Aleksa, M.

AU - Aleksandrov, I. N.

AU - Alexa, C.

AU - Alexander, G.

AU - Alexopoulos, T.

AU - Alhroob, M.

AU - Alimonti, G.

AU - Alio, L.

AU - Alison, J.

AU - Alkire, S. P.

AU - Allbrooke, B. M.M.

AU - Allport, P. P.

AU - Aloisio, A.

AU - Alonso, A.

AU - Alonso, F.

AU - Alpigiani, C.

AU - Altheimer, A.

AU - Alvarez Gonzalez, B.

AU - Yuan, L.

PY - 2016/5/10

Y1 - 2016/5/10

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/85042024827

U2 - 10.1016/j.physletb.2016.03.017

DO - 10.1016/j.physletb.2016.03.017

M3 - 文章

AN - SCOPUS:85042024827

SN - 0370-2693

VL - 756

SP - 228

EP - 246

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -

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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