Measurement of the production cross-section of a single top quark in association with a Z boson in proton-proton collisions at 13 TeV with the ATLAS detector

被引：45

作者：

Aaboud, M. ^{[195
,196
]}

Aad, G. ^{[129
,130
]}

Abbott, B. ^{[161
]}

Abdinov, O. ^{[15
]}

Abeloos, B. ^{[165
]}

Abidi, S. H. ^{[227
]}

AbouZeid, O. S. ^{[199
]}

Abraham, N. L. ^{[216
]}

Abramowicz, H. ^{[220
]}

Abreu, H. ^{[219
]}

Abreu, R. ^{[164
]}

Abulaiti, Y. ^{[211
,212
]}

Acharya, B. S. ^{[236
,237
,254
]}

Adachi, S. ^{[222
,223
]}

Adamczyk, L. ^{[67
]}

Adelman, J. ^{[156
]}

Adersberger, M. ^{[145
]}

Adye, T. ^{[186
]}

Affolder, A. A. ^{[199
]}

Afik, Y. ^{[219
]}

Agatonovic-Jovin, T. ^{[17
]}

Agheorghiesei, C. ^{[42
]}

Aguilar-Saavedra, J. A. ^{[176
,181
]}

Ahlen, S. P. ^{[33
]}

Ahmadov, F. ^{[15
,103
]}

Aielli, G. ^{[189
,190
]}

Akatsuka, S. ^{[106
]}

Akerstedt, H. ^{[211
,212
]}

Akesson, T. P. A. ^{[125
]}

Akilli, E. ^{[81
]}

Akimov, A. V. ^{[141
]}

Alberghi, G. L. ^{[30
,31
]}

Albert, J. ^{[243
]}

Albicocco, P. ^{[78
,79
]}

Alconada Verzini, M. J. ^{[110
,111
]}

Alderweireldt, S. C. ^{[153
]}

Aleksa, M. ^{[48
]}

Aleksandrov, I. N. ^{[103
]}

Alexa, C. ^{[41
]}

Alexander, G. ^{[220
]}

Alexopoulos, T. ^{[13
]}

Alhroob, M. ^{[161
]}

Ali, B. ^{[183
]}

Aliev, M. ^{[113
,114
]}

Alimonti, G. ^{[136
]}

Alison, J. ^{[49
]}

Alkire, S. P. ^{[63
]}

Allbrooke, B. M. M. ^{[216
]}

Allen, B. W. ^{[164
]}

Allport, P. P. ^{[24
]}

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, 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 Mt 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] Natl & Kapodistrian Univ Athens, Dept Phys, Athens, Greece

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

[14] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA

[15] Azerbaijan Acad Sci, Inst Phys, Baku, Azerbaijan

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

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

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

[19] Lawrence Berkeley Natl Lab, Div Phys, Berkeley, CA USA

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

[21] Humboldt Univ, Dept Phys, Berlin, Germany

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

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

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

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

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

[27] Istanbul Bilgi Univ, Fac Engn & Nat Sci, Istanbul, Turkey

[28] Bahcesehir Univ, Fac Engn & Nat Sci, Istanbul, Turkey

[29] Univ Antonio Narino, Ctr Invest, Bogota, Colombia

[30] INFN Sez Bologna, Bologna, Italy

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

[32] Univ Bonn, Phys Inst, Bonn, Germany

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

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

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

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

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

[38] Univ Sao Paulo, Inst Fis, Sao Paulo, Brazil

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

[40] Transilvania Univ Brasov, Brasov, Romania

[41] Horia Hulubei Natl Inst Phys & Nucl Engn, Bucharest, Romania

[42] Alexandru Ioan Cuza Univ, Dept Phys, Iasi, Romania

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

[44] West Univ Timisoara, Timisoara, Romania

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

[46] Univ Cambridge, Cavendish Lab, Cambridge, England

[47] Carleton Univ, Dept Phys, Ottawa, ON, Canada

[48] CERN, Geneva, Switzerland

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

[50] Pontificia Univ Catolica Chile, Dept Fis, Santiago, Chile

来源：

PHYSICS LETTERS B | 2018年 / 780卷

基金：

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

关键词：

D O I：

10.1016/j.physletb.2018.03.023

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The production of a top quark in association with a Z boson is investigated. The proton-proton collision data collected by the ATLAS experiment at the LHC in 2015 and 2016 at a centre-of-mass energy of root s = 13 TeV are used, corresponding to an integrated luminosity of 36.1 fb(-1). Events containing three identified leptons (electrons and/or muons) and two jets, one of which is identified as a b-quark jet are selected. The major backgrounds are diboson, tt($)over-bar and Z + jets production. A neural network is used to improve the background rejection and extract the signal. The resulting significance is 4.2 sigma in the data and the expected significance is 5.4 sigma. The measured cross-section for tZq production is 600 +/- 170(stat.)+/- 140(syst.)fb. (C) 2018 The Author(s). Published by Elsevier B.V.

引用

页码：557 / 577

页数：21

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