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

被引：51

作者：

Aad, G. ^{[119
,120
]}

Abbott, B. ^{[152
]}

Abdallah, J. ^{[212
]}

Abdinov, O. ^{[14
]}

Aben, R. ^{[145
,146
]}

Abolins, M. ^{[125
]}

AbouZeid, O. S. ^{[220
]}

Abramowicz, H. ^{[214
]}

Abreu, H. ^{[213
]}

Abreu, R. ^{[155
]}

Abulaiti, Y. ^{[205
,206
]}

Acharya, B. S. ^{[228
,229
,248
]}

Adamczyk, L. ^{[59
]}

Adams, D. L. ^{[36
]}

Adelman, J. ^{[147
]}

Adomeit, S. ^{[136
]}

Adye, T. ^{[179
]}

Affolder, A. A. ^{[105
]}

Agatonovic-Jovin, T. ^{[16
]}

Agricola, J. ^{[79
]}

Aguilar-Saavedra, J. A. ^{[168
,173
,174
]}

Ahlen, S. P. ^{[30
]}

Ahmadov, F. ^{[14
,94
]}

Aielli, G. ^{[182
,183
]}

Akerstedt, H. ^{[205
,206
]}

Akesson, T. P. A. ^{[115
]}

Akimov, A. V. ^{[132
]}

Alberghi, G. L. ^{[27
,28
]}

Albert, J. ^{[238
]}

Albrand, S. ^{[80
]}

Alconada Verzini, M. J. ^{[100
,101
]}

Aleksa, M. ^{[42
]}

Aleksandrov, I. N. ^{[94
]}

Alexa, C. ^{[37
]}

Alexander, G. ^{[214
]}

Alexopoulos, T. ^{[13
]}

Alhroob, M. ^{[152
]}

Alimonti, G. ^{[126
]}

Alio, L. ^{[119
,120
]}

Alison, J. ^{[43
]}

Alkire, S. P. ^{[55
]}

Allbrooke, B. M. M. ^{[210
]}

Allport, P. P. ^{[23
]}

Aloisio, A. ^{[141
,142
]}

Alonso, A. ^{[56
,71
]}

Alonso, F. ^{[100
,101
]}

Alpigiani, C. ^{[194
]}

Altheimer, A. ^{[55
]}

Gonzalez, B. Alvarez ^{[42
]}

Alvarez Piqueras, D. ^{[232
,233
,234
,235
,236
]}

机构：

[1] Univ Adelaide, Dept Phys, Adelaide, SA, Australia

[2] SUNY Albany, Dept Phys, Albany, NY 12222 USA

[3] Univ Alberta, Dept Phys, Edmonton, AB, Canada

[4] Ankara Univ, Dept Phys, TR-06100 Ankara, Turkey

[5] Istanbul Aydin Univ, Istanbul, Turkey

[6] TOBB Univ Econ & Technol, Div Phys, Ankara, Turkey

[7] CNRS, IN2P3, LAPP, Annecy Le Vieux, France

[8] Univ Savoie Mont Blanc, Annecy Le Vieux, France

[9] Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA

[10] Univ Arizona, Dept Phys, Tucson, AZ 85721 USA

[11] Univ Texas Arlington, Dept Phys, POB 19059, Arlington, TX 76019 USA

[12] Univ Athens, Dept Phys, Athens, Greece

[13] Natl Tech Univ Athens, Dept Phys, Zografos, Greece

[14] Azerbaijan Acad Sci, Inst Phys, Baku 370143, Azerbaijan

[15] Barcelona Inst Sci & Technol, Inst Fis Altes Energies, Barcelona, Spain

[16] Univ Belgrade, Inst Phys, Belgrade, Serbia

[17] Univ Bergen, Dept Phys & Technol, Bergen, Norway

[18] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Phys, Berkeley, CA 94720 USA

[19] Univ Calif Berkeley, Berkeley, CA 94720 USA

[20] Humboldt Univ, Dept Phys, Invalidenstr 110, Berlin, Germany

[21] Univ Bern, Albert Einstein Ctr Fundamental Phys, Bern, Switzerland

[22] Univ Bern, High Energy Phys Lab, Bern, Switzerland

[23] Univ Birmingham, Sch Phys & Astron, Birmingham, W Midlands, England

[24] Bogazici Univ, Dept Phys, Istanbul, Turkey

[25] Gaziantep Univ, Dept Engn Phys, Gaziantep, Turkey

[26] Dogus Univ, Dept Phys, Istanbul, Turkey

[27] Ist Nazl Fis Nucl, Sez Bologna, I-40126 Bologna, Italy

[28] Univ Bologna, Dipartimento Fis & Astron, Bologna, Italy

[29] Univ Bonn, Inst Phys, Nussallee 12, Bonn, Germany

[30] Boston Univ, Dept Phys, 590 Commonwealth Ave, Boston, MA 02215 USA

[31] Brandeis Univ, Dept Phys, Waltham, MA 02254 USA

[32] Univ Fed Rio de Janeiro, COPPE EE IF, Rio De Janeiro, Brazil

[33] Fed Univ Juiz de Fora UFJF, Elect Circuits Dept, Juiz De Fora, Brazil

[34] Fed Univ Sao Joao del Rei UFSJ, Sao Joao Del Rei, Brazil

[35] Univ Sao Paulo, Inst Fis, CP 20516, BR-01498 Sao Paulo, Brazil

[36] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA

[37] Natl Inst Phys & Nucl Engn, Bucharest, Romania

[38] Natl Inst Res & Dev Isotop & Mol Technol, Dept Phys, Cluj Napoca, Romania

[39] Univ Buenos Aires, Dept Fis, Buenos Aires, DF, Argentina

[40] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[41] Carleton Univ, Dept Phys, Ottawa, ON K1S 5B6, Canada

[42] CERN, Geneva, Switzerland

[43] Univ Chicago, Enrico Fermi Inst, 5640 S Ellis Ave, Chicago, IL 60637 USA

[44] Pontificia Univ Catolica Chile, Dept Fis, Alameda 340, Santiago, Chile

[45] Univ Tecn Federico Santa Maria, Dept Fis, Valparaiso, Chile

[46] Chinese Acad Sci, Inst High Energy Phys, Beijing, Peoples R China

[47] Univ Sci & Technol China, Dept Modern Phys, Wuhan, Anhui, Peoples R China

[48] Nanjing Univ, Dept Phys, Nanjing, Jiangsu, Peoples R China

[49] Shandong Univ, Sch Phys, Jinan, Shandong, Peoples R China

[50] Shanghai Jiao Tong Univ, Shanghai Key Lab Particle Phys & Cosmol, Dept Phys & Astron, Shanghai 200030, Peoples R China

来源：

PHYSICS LETTERS B | 2016年 / 756卷

基金：

欧盟地平线“2020”; 巴西圣保罗研究基金会; 美国国家科学基金会; 加拿大自然科学与工程研究理事会;

关键词：

HADRON COLLIDERS; PARTON DISTRIBUTIONS; LIKELIHOOD METHOD; MISSING MOMENTUM; RECONSTRUCTION; ALGORITHM; EVENTS; QCD;

D O I：

10.1016/j.physletb.2016.03.017

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

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 sigma 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. (C) 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.

引用

页码：228 / 246

页数：19

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