Observation of Single Top Quark Production in Association with a Z Boson in Proton-Proton Collisions at s =13 TeV

CMS Collaboration

doi:10.1103/PhysRevLett.122.132003

Observation of Single Top Quark Production in Association with a Z Boson in Proton-Proton Collisions at s =13 TeV

CMS Collaboration

University of Wisconsin-Madison
Yerevan Physics Institute
Institut für Hochenergiephysik
Vienna University of Technology
Institute for Nuclear Problems of Belarusian State University
University of Antwerp
Université Paris-Saclay
c/o DESY
INFN Sezione di Torino
University of Turin
Vrjie Universiteit Brussel
Université Libre de Bruxelles
Moscow State University
Ghent University
University of Louvain
Centro Brasileiro de Pesquisas Fisicas
Rua São Francisco de Xavier
University of Campinas (UNICAMP)
Universidade Federal do Rio Grande do Sul
São Paulo State University
Federal University of ABC (UFABC)
Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences
University of Sofia
Beihang University
Institute of High Energy Physics, Chinese Academy of Sciences
Chinese Academy of Sciences
Tsinghua University
Tsinghua University
Universidad de Los Andes, Colombia
Universidad de Antioquia
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split
Faculty of Science, University of Split
Ruđer Bošković Institute
Institute for Theoretical and Experimental Physics
University of Cyprus
Charles University
Joint Institute for Nuclear Research, Dubna
Escuela Politecnica Nacional
Universidad San Francisco de Quito
Egyptian Network of High Energy Physics
Cairo University
British University in Egypt
Suez University
Zewail City of Science and Technology
National Institute of Chemical Physics and Biophysics, Tallinn
University of Helsinki
Helsinki Institute of Physics
LUT University
Purdue University
Université de Strasbourg
Université de Haute Alsace
Université Paris-Sud
IGFL, Université de Lyon, Université Lyon 1
Georgian Technical University
Tbilisi State University
RWTH Aachen University
European Organization for Nuclear Research
Universität Hamburg
Joint Faculty of the Brandenburg University of Technology Cottbus Senftenberg
Institute of Meteorology and Climate Research
NCSR Demokritos
University of Athens
National Technical University of Athens
University of Ioannina
Eötvös Loránd University
University of Debrecen
Wigner Research Centre for Physics
Institute of Nuclear Research ATOMKI
University of Hyderabad
Indian Institute of Science
National Institute of Science Education and Research
IIT Bhubaneswar
Institute of Physics Bhubaneswar
Panjab University
University of Delhi
Saha Institute of Nuclear Physics
Shoolini University
University of Visva-Bharati
Indian Institute of Technology Madras
Bhabha Atomic Research Centre
Tata Institute of Fundamental Research, Mumbai
Indian Institute of Science Education and Research (IISER)
Institute for Research in Fundamental Sciences (IPM)
Isfahan University of Technology
Islamic Azad University, Science and Research Branch
University College Dublin
INFN Sezione di Bari
Università degli studi di Bari Aldo Moro
Politecnico di Bari
INFN Sezione di Bologna
University of Bologna
ENEA Climate Modeling and Impacts
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Università degli Studi di Catania
CSFNSM
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
University of Florence
University of Siena
LNF-INFN
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University of Genoa
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University of Milano-Bicocca
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Università di Trento
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Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
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Scuola Normale Superiore di Pisa
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Laboratory of Molecular Pathology
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Kyungpook National University
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Hanyang University
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Benemerita Universidad Autonoma de Puebla
Universidad Autónoma de San Luis Potosi
University of Montenegro
University of Auckland
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Quaid-i-Azam University
National Centre for Nuclear Research
University of Warsaw
Warsaw University of Technology
Lisboa
Institute for Nuclear Research of the Russian Academy of Sciences
National Research Nuclear University MEPhI
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University of Florida
Moscow Institute of Physics and Technology
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
California Institute of Technology
Novosibirsk State University
Budker Institute of Nuclear Physics of the Siberian Branch of the RAS
Kurchatov Institute
National Research Tomsk Polytechnic University
University of Belgrade
University of Belgrade
Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT)
Universidad Autónoma de Madrid
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Women and Infants Hospital of Rhode Island-Warren Alpert Medical School of Brown University
Bethel University
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University of California, San Diego
University of California, Santa Barbara
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Abstract

The observation of single top quark production in association with a Z boson and a quark (tZq) is reported. Events from proton-proton collisions at a center-of-mass energy of 13 TeV containing three charged leptons (either electrons or muons) and at least two jets are analyzed. The data were collected with the CMS detector in 2016 and 2017 and correspond to an integrated luminosity of 77.4fb-1. The increased integrated luminosity, a multivariate lepton identification, and a redesigned analysis strategy improve significantly the sensitivity of the analysis compared to previous searches for tZq production. The tZq signal is observed with a significance well over 5 standard deviations. The measured tZq production cross section is σ(pp→tZq→t?+?-q)=111±13(stat)-9+11(syst) fb, for dilepton invariant masses above 30 GeV, in agreement with the standard model expectation.

Original language	English
Article number	132003
Journal	Physical Review Letters
Volume	122
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevLett.122.132003
Publication status	Published - 5 Apr 2019
Externally published	Yes

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10.1103/PhysRevLett.122.132003

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@article{3e6f47a03749425bb7fd7cca725ca9c8,

title = "Observation of Single Top Quark Production in Association with a Z Boson in Proton-Proton Collisions at s =13 TeV",

abstract = "The observation of single top quark production in association with a Z boson and a quark (tZq) is reported. Events from proton-proton collisions at a center-of-mass energy of 13 TeV containing three charged leptons (either electrons or muons) and at least two jets are analyzed. The data were collected with the CMS detector in 2016 and 2017 and correspond to an integrated luminosity of 77.4fb-1. The increased integrated luminosity, a multivariate lepton identification, and a redesigned analysis strategy improve significantly the sensitivity of the analysis compared to previous searches for tZq production. The tZq signal is observed with a significance well over 5 standard deviations. The measured tZq production cross section is σ(pp→tZq→t?+?-q)=111±13(stat)-9+11(syst) fb, for dilepton invariant masses above 30 GeV, in agreement with the standard model expectation.",

author = "\{CMS Collaboration\} and Sirunyan, \{A. M.\} and A. Tumasyan and W. Adam and F. Ambrogi and E. Asilar and T. Bergauer and J. Brandstetter and M. Dragicevic and J. Er{\"o} and \{Escalante Del Valle\}, A. and M. Flechl and R. Fr{\"u}hwirth and Ghete, \{V. M.\} and J. Hrubec and M. Jeitler and N. Krammer and I. Kr{\"a}tschmer and D. Liko and T. Madlener and I. Mikulec and N. Rad and H. Rohringer and J. Schieck and R. Sch{\"o}fbeck and M. Spanring and D. Spitzbart and W. Waltenberger and J. Wittmann and Wulz, \{C. E.\} and M. Zarucki and V. Chekhovsky and V. Mossolov and \{Suarez Gonzalez\}, J. and \{De Wolf\}, \{E. A.\} and \{Di Croce\}, D. and X. Janssen and J. Lauwers and A. Lelek and M. Pieters and \{Van Haevermaet\}, H. and F. Beaudette and \{Granier De Cassagnac\}, R. and M. Nguyen and C. Ochando and P. Paganini and R. Salerno and A. Zabi and A. Zghiche and \{De Wit\}, A. and A. Cappati",

note = "Publisher Copyright: {\textcopyright} 2019 CERN.",

year = "2019",

month = apr,

day = "5",

doi = "10.1103/PhysRevLett.122.132003",

language = "English",

volume = "122",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

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TY - JOUR

T1 - Observation of Single Top Quark Production in Association with a Z Boson in Proton-Proton Collisions at s =13 TeV

AU - CMS Collaboration

AU - Sirunyan, A. M.

AU - Tumasyan, A.

AU - Adam, W.

AU - Ambrogi, F.

AU - Asilar, E.

AU - Bergauer, T.

AU - Brandstetter, J.

AU - Dragicevic, M.

AU - Erö, J.

AU - Escalante Del Valle, A.

AU - Flechl, M.

AU - Frühwirth, R.

AU - Ghete, V. M.

AU - Hrubec, J.

AU - Jeitler, M.

AU - Krammer, N.

AU - Krätschmer, I.

AU - Liko, D.

AU - Madlener, T.

AU - Mikulec, I.

AU - Rad, N.

AU - Rohringer, H.

AU - Schieck, J.

AU - Schöfbeck, R.

AU - Spanring, M.

AU - Spitzbart, D.

AU - Waltenberger, W.

AU - Wittmann, J.

AU - Wulz, C. E.

AU - Zarucki, M.

AU - Chekhovsky, V.

AU - Mossolov, V.

AU - Suarez Gonzalez, J.

AU - De Wolf, E. A.

AU - Di Croce, D.

AU - Janssen, X.

AU - Lauwers, J.

AU - Lelek, A.

AU - Pieters, M.

AU - Van Haevermaet, H.

AU - Beaudette, F.

AU - Granier De Cassagnac, R.

AU - Nguyen, M.

AU - Ochando, C.

AU - Paganini, P.

AU - Salerno, R.

AU - Zabi, A.

AU - Zghiche, A.

AU - De Wit, A.

AU - Cappati, A.

PY - 2019/4/5

Y1 - 2019/4/5

N2 - The observation of single top quark production in association with a Z boson and a quark (tZq) is reported. Events from proton-proton collisions at a center-of-mass energy of 13 TeV containing three charged leptons (either electrons or muons) and at least two jets are analyzed. The data were collected with the CMS detector in 2016 and 2017 and correspond to an integrated luminosity of 77.4fb-1. The increased integrated luminosity, a multivariate lepton identification, and a redesigned analysis strategy improve significantly the sensitivity of the analysis compared to previous searches for tZq production. The tZq signal is observed with a significance well over 5 standard deviations. The measured tZq production cross section is σ(pp→tZq→t?+?-q)=111±13(stat)-9+11(syst) fb, for dilepton invariant masses above 30 GeV, in agreement with the standard model expectation.

AB - The observation of single top quark production in association with a Z boson and a quark (tZq) is reported. Events from proton-proton collisions at a center-of-mass energy of 13 TeV containing three charged leptons (either electrons or muons) and at least two jets are analyzed. The data were collected with the CMS detector in 2016 and 2017 and correspond to an integrated luminosity of 77.4fb-1. The increased integrated luminosity, a multivariate lepton identification, and a redesigned analysis strategy improve significantly the sensitivity of the analysis compared to previous searches for tZq production. The tZq signal is observed with a significance well over 5 standard deviations. The measured tZq production cross section is σ(pp→tZq→t?+?-q)=111±13(stat)-9+11(syst) fb, for dilepton invariant masses above 30 GeV, in agreement with the standard model expectation.

U2 - 10.1103/PhysRevLett.122.132003

DO - 10.1103/PhysRevLett.122.132003

M3 - Article

C2 - 31012605

AN - SCOPUS:85064398210

SN - 0031-9007

VL - 122

JO - Physical Review Letters

JF - Physical Review Letters

IS - 13

M1 - 132003

ER -

Observation of Single Top Quark Production in Association with a Z Boson in Proton-Proton Collisions at s =13 TeV

Abstract

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