Observation of top quark pairs produced in association with a vector boson in pp collisions at √s = 8 TeV

The CMS collaboration

doi:10.1007/JHEP01(2016)096

Observation of top quark pairs produced in association with a vector boson in pp collisions at √s = 8 TeV

The CMS collaboration

A. Alikhanian Yerevan Institute of Physics
Austrian Academy of Sciences
TU Wien
CERN
Belarusian State University
University of Antwerp
Texas A&M University at Qatar
Texas A&M University
Vrije Universiteit Brussel
Université libre de Bruxelles
Peking University
Ghent University
Université catholique de Louvain
Institut Pluridisciplinaire - Hubert Curien (IPHC)
National Institute of Chemical Physics and Biophysics, Tallinn
Lomonosov Moscow State University
Universite de Mons
Centro Brasileiro de Pesquisas Físicas
Universidade do Estado do Rio de Janeiro
Universidade Estadual de Campinas
Universidade Estadual Paulista Júlio de Mesquita Filho
Universidade Federal do ABC
CNRS
Bulgarian Academy of Sciences
Sofia University St. Kliment Ohridski
CAS - Institute of High Energy Physics
IN2P3-CNRS
Universidad de los Andes Colombia
Universidad de Cantabria
University of Split
Ruder Boskovic Institute
University of Cyprus
Charles University
Joint Institute for Nuclear Research
Helwan University
Zewail City of Science and Technology
Academy of Scientific Research and Technology
Ain Shams University
The British University in Egypt
Al-Fayoum University
University of Helsinki
Helsinki Institute of Physics
Lappeenranta-Lahti University of Technology
CEA/Saclay
Université de Haute-Alsace
CNRS/IN2P3-Univ Mediterranee
Universite Claude Bernard Lyon 1
Ivane Javakhishvili Tbilisi State University
Georgian Technical University
RWTH Aachen University
German Electron Synchrotron
University of Hamburg
Brandenburg University of Technology
Institut für Experimentelle Kernphysik
Demokritos National Centre for Scientific Research
National and Kapodistrian University of Athens
University of Ioannina
Wigner Research Centre for Physics
Institute for Nuclear Research
Eötvös Loránd University
University of Debrecen
National Institute of Science Education and Research
Panjab University
University of Delhi
Tata Institute of Fundamental Research
Bhabha Atomic Research Centre
Visva-Bharati University
King Abdulaziz University
University of Ruhuna
Indian Institute of Science Education and Research Pune
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Isfahan University of Technology
University of Tehran
Islamic Azad University
University College Dublin
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University of Bari
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Research output: Contribution to journal › Article › peer-review

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Abstract

Measurements of the cross sections for top quark pairs produced in association with a W or Z boson are presented, using 8 TeV pp collision data corresponding to an integrated luminosity of 19.5 fb^-1, collected by the CMS experiment at the LHC. Final states are selected in which the associated W boson decays to a charged lepton and a neutrino or the Z boson decays to two charged leptons. Signal events are identified by matching reconstructed objects in the detector to specific final state particles from tt̄W or tt̄Z decays. The tt̄W cross section is measured to be (Formula Presented) fb with a significance of 4.8 standard deviations from the background-only hypothesis. The tt̄Z cross section is measured to be (Formula Presented) fb with a significance of 6.4 standard deviations from the background-only hypothesis. These measurements are used to set bounds on five anomalous dimension-six operators that would affect the tt̄W and tt̄Z cross sections.

Original language	English
Article number	96
Journal	Journal of High Energy Physics
Volume	2016
Issue number	1
DOIs	https://doi.org/10.1007/JHEP01(2016)096
Publication status	Published - 2016
Externally published	Yes

Keywords

Electroweak interaction
Hadron-Hadron scattering
Top physics

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10.1007/JHEP01(2016)096

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title = "Observation of top quark pairs produced in association with a vector boson in pp collisions at √s = 8 TeV",

abstract = "Measurements of the cross sections for top quark pairs produced in association with a W or Z boson are presented, using 8 TeV pp collision data corresponding to an integrated luminosity of 19.5 fb-1, collected by the CMS experiment at the LHC. Final states are selected in which the associated W boson decays to a charged lepton and a neutrino or the Z boson decays to two charged leptons. Signal events are identified by matching reconstructed objects in the detector to specific final state particles from t{\=t}W or t{\=t}Z decays. The t{\=t}W cross section is measured to be (Formula Presented) fb with a significance of 4.8 standard deviations from the background-only hypothesis. The t{\=t}Z cross section is measured to be (Formula Presented) fb with a significance of 6.4 standard deviations from the background-only hypothesis. These measurements are used to set bounds on five anomalous dimension-six operators that would affect the t{\=t}W and t{\=t}Z cross sections.",

keywords = "Electroweak interaction, Hadron-Hadron scattering, Top physics",

author = "\{The CMS collaboration\} and V. Khachatryan and Sirunyan, \{A. M.\} and A. Tumasyan and W. Adam and E. Asilar and T. Bergauer and J. Brandstetter and E. Brondolin and M. Dragicevic and J. Er{\"o} and M. Flechl and M. Friedl and R. Fr{\"u}hwirth and Ghete, \{V. M.\} and C. Hartl and N. H{\"o}rmann and J. Hrubec and M. Jeitler and V. Kn{\"u}nz and A. K{\"o}nig and M. Krammer and I. Kr{\"a}tschmer and D. Liko and T. Matsushita and I. Mikulec and D. Rabady and B. Rahbaran and H. Rohringer and J. Schieck and R. Sch{\"o}fbeck and J. Strauss and W. Treberer-Treberspurg and W. Waltenberger and Wulz, \{C. E.\} and V. Mossolov and N. Shumeiko and \{Suarez Gonzalez\}, J. and S. Alderweireldt and T. Cornelis and \{De Wolf\}, \{E. A.\} and X. Janssen and A. Knutsson and J. Lauwers and S. Luyckx and R. Rougny and \{Van De Klundert\}, M. and \{Van Haevermaet\}, H. and \{Van Mechelen\}, P. and \{Van Remortel\}, N. and O. Bouhali",

year = "2016",

doi = "10.1007/JHEP01(2016)096",

language = "English",

volume = "2016",

journal = "Journal of High Energy Physics",

issn = "1029-8479",

publisher = "Springer Verlag",

number = "1",

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T1 - Observation of top quark pairs produced in association with a vector boson in pp collisions at √s = 8 TeV

AU - The CMS collaboration

AU - Khachatryan, V.

AU - Sirunyan, A. M.

AU - Tumasyan, A.

AU - Adam, W.

AU - Asilar, E.

AU - Bergauer, T.

AU - Brandstetter, J.

AU - Brondolin, E.

AU - Dragicevic, M.

AU - Erö, J.

AU - Flechl, M.

AU - Friedl, M.

AU - Frühwirth, R.

AU - Ghete, V. M.

AU - Hartl, C.

AU - Hörmann, N.

AU - Hrubec, J.

AU - Jeitler, M.

AU - Knünz, V.

AU - König, A.

AU - Krammer, M.

AU - Krätschmer, I.

AU - Liko, D.

AU - Matsushita, T.

AU - Mikulec, I.

AU - Rabady, D.

AU - Rahbaran, B.

AU - Rohringer, H.

AU - Schieck, J.

AU - Schöfbeck, R.

AU - Strauss, J.

AU - Treberer-Treberspurg, W.

AU - Waltenberger, W.

AU - Wulz, C. E.

AU - Mossolov, V.

AU - Shumeiko, N.

AU - Suarez Gonzalez, J.

AU - Alderweireldt, S.

AU - Cornelis, T.

AU - De Wolf, E. A.

AU - Janssen, X.

AU - Knutsson, A.

AU - Lauwers, J.

AU - Luyckx, S.

AU - Rougny, R.

AU - Van De Klundert, M.

AU - Van Haevermaet, H.

AU - Van Mechelen, P.

AU - Van Remortel, N.

AU - Bouhali, O.

PY - 2016

Y1 - 2016

N2 - Measurements of the cross sections for top quark pairs produced in association with a W or Z boson are presented, using 8 TeV pp collision data corresponding to an integrated luminosity of 19.5 fb-1, collected by the CMS experiment at the LHC. Final states are selected in which the associated W boson decays to a charged lepton and a neutrino or the Z boson decays to two charged leptons. Signal events are identified by matching reconstructed objects in the detector to specific final state particles from tt̄W or tt̄Z decays. The tt̄W cross section is measured to be (Formula Presented) fb with a significance of 4.8 standard deviations from the background-only hypothesis. The tt̄Z cross section is measured to be (Formula Presented) fb with a significance of 6.4 standard deviations from the background-only hypothesis. These measurements are used to set bounds on five anomalous dimension-six operators that would affect the tt̄W and tt̄Z cross sections.

AB - Measurements of the cross sections for top quark pairs produced in association with a W or Z boson are presented, using 8 TeV pp collision data corresponding to an integrated luminosity of 19.5 fb-1, collected by the CMS experiment at the LHC. Final states are selected in which the associated W boson decays to a charged lepton and a neutrino or the Z boson decays to two charged leptons. Signal events are identified by matching reconstructed objects in the detector to specific final state particles from tt̄W or tt̄Z decays. The tt̄W cross section is measured to be (Formula Presented) fb with a significance of 4.8 standard deviations from the background-only hypothesis. The tt̄Z cross section is measured to be (Formula Presented) fb with a significance of 6.4 standard deviations from the background-only hypothesis. These measurements are used to set bounds on five anomalous dimension-six operators that would affect the tt̄W and tt̄Z cross sections.

KW - Electroweak interaction

KW - Hadron-Hadron scattering

KW - Top physics

UR - https://www.scopus.com/pages/publications/85009932536

U2 - 10.1007/JHEP01(2016)096

DO - 10.1007/JHEP01(2016)096

M3 - Article

AN - SCOPUS:85009932536

SN - 1029-8479

VL - 2016

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 1

M1 - 96

ER -

Observation of top quark pairs produced in association with a vector boson in pp collisions at √s = 8 TeV

Abstract

Keywords

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