https://doi.org/10.1140/epjc/s10052-019-7387-y
Regular Article - Experimental Physics
Search for new physics in top quark production in dilepton final states in proton-proton collisions at 
1
Yerevan Physics Institute, Yerevan, Armenia
2
Institut für Hochenergiephysik, Vienna, Austria
3
Institute for Nuclear Problems, Minsk, Belarus
4
Universiteit Antwerpen, Antwerp, Belgium
5
Vrije Universiteit Brussel, Brussels, Belgium
6
Université Libre de Bruxelles, Brussels, Belgium
7
Ghent University, Ghent, Belgium
8
Université Catholique de Louvain, Louvain-la-Neuve, Belgium
9
Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, Brazil
10
Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
11
Universidade Estadual Paulista, Universidade Federal do ABC, São Paulo, Brazil
12
Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Sofia, Bulgaria
13
University of Sofia, Sofia, Bulgaria
14
Beihang University, Beijing, China
15
Institute of High Energy Physics, Beijing, China
16
State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China
17
Tsinghua University, Beijing, China
18
Universidad de Los Andes, Bogotá, Colombia
19
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split, Split, Croatia
20
Faculty of Science, University of Split, Split, Croatia
21
Institute Rudjer Boskovic, Zagreb, Croatia
22
University of Cyprus, Nicosia, Cyprus
23
Charles University, Prague, Czech Republic
24
Escuela Politecnica Nacional, Quito, Ecuador
25
Universidad San Francisco de Quito, Quito, Ecuador
26
Academy of Scientific Research and Technology of the Arab Republic of Egypt, Egyptian Network of High Energy Physics, Cairo, Egypt
27
National Institute of Chemical Physics and Biophysics, Tallinn, Estonia
28
Department of Physics, University of Helsinki, Helsinki, Finland
29
Helsinki Institute of Physics, Helsinki, Finland
30
Lappeenranta University of Technology, Lappeenranta, Finland
31
IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France
32
Laboratoire Leprince-Ringuet, Ecole polytechnique, CNRS/IN2P3, Université Paris-Saclay, Palaiseau, France
33
Université de Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, France
34
Centre de Calcul de l’Institut National de Physique Nucleaire et de Physique des Particules, CNRS/IN2P3, Villeurbanne, France
35
Université de Lyon, Université Claude Bernard Lyon 1, CNRS-IN2P3, Institut de Physique Nucléaire de Lyon, Villeurbanne, France
36
Georgian Technical University, Tbilisi, Georgia
37
Tbilisi State University, Tbilisi, Georgia
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I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany
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III. Physikalisches Institut A, RWTH Aachen University, Aachen, Germany
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III. Physikalisches Institut B, RWTH Aachen University, Aachen, Germany
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Deutsches Elektronen-Synchrotron, Hamburg, Germany
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University of Hamburg, Hamburg, Germany
43
Karlsruher Institut fuer Technologie, Karlsruhe, Germany
44
Institute of Nuclear and Particle Physics (INPP), NCSR Demokritos, Aghia Paraskevi, Greece
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National and Kapodistrian University of Athens, Athens, Greece
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National Technical University of Athens, Athens, Greece
47
University of Ioánnina, Ioánnina, Greece
48
MTA-ELTE Lendület CMS Particle and Nuclear Physics Group, Eötvös Loránd University, Budapest, Hungary
49
Wigner Research Centre for Physics, Budapest, Hungary
50
Institute of Nuclear Research ATOMKI, Debrecen, Hungary
51
Institute of Physics, University of Debrecen, Debrecen, Hungary
52
Indian Institute of Science (IISc), Bangalore, India
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National Institute of Science Education and Research, HBNI, Bhubaneswar, India
54
Panjab University, Chandigarh, India
55
University of Delhi, Delhi, India
56
Saha Institute of Nuclear Physics, HBNI, Kolkata, India
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Indian Institute of Technology Madras, Madras, India
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Bhabha Atomic Research Centre, Mumbai, India
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Tata Institute of Fundamental Research-A, Mumbai, India
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Tata Institute of Fundamental Research-B, Mumbai, India
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Indian Institute of Science Education and Research (IISER), Pune, India
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Institute for Research in Fundamental Sciences (IPM), Tehran, Iran
63
University College Dublin, Dublin, Ireland
64
INFN Sezione di Bari, Università di Bari, Politecnico di Bari, Bari, Italy
65
INFN Sezione di Bologna, Università di Bologna, Bologna, Italy
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INFN Sezione di Catania, Università di Catania, Catania, Italy
67
INFN Sezione di Firenze, Università di Firenze, Florence, Italy
68
INFN Laboratori Nazionali di Frascati, Frascati, Italy
69
INFN Sezione di Genova, Università di Genova, Genoa, Italy
70
INFN Sezione di Milano-Bicocca, Università di Milano-Bicocca, Milan, Italy
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INFN Sezione di Napoli, Università di Napoli ’Federico II’ , Naples, Italy, Università della Basilicata, Potenza, Italy, Università G. Marconi, Rome, Italy
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INFN Sezione di Padova, Università di Padova, Padova, Italy, Università di Trento, Trento, Italy
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INFN Sezione di Pavia, Università di Pavia, Pavia, Italy
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INFN Sezione di Perugia, Università di Perugia, Perugia, Italy
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INFN Sezione di Pisa, Università di Pisa, Scuola Normale Superiore di Pisa, Pisa, Italy
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INFN Sezione di Roma, Sapienza Università di Roma, Rome, Italy
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INFN Sezione di Torino, Università di Torino, Torino, Italy, Università del Piemonte Orientale, Novara, Italy
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INFN Sezione di Trieste, Università di Trieste, Trieste, Italy
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Kyungpook National University, Daegu, Korea
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Institute for Universe and Elementary Particles, Chonnam National University, Kwangju, Korea
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Hanyang University, Seoul, Korea
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Korea University, Seoul, Korea
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Sejong University, Seoul, Korea
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Seoul National University, Seoul, Korea
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University of Seoul, Seoul, Korea
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Sungkyunkwan University, Suwon, Korea
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Riga Technical University, Riga, Latvia
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Vilnius University, Vilnius, Lithuania
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National Centre for Particle Physics, Universiti Malaya, Kuala Lumpur, Malaysia
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Universidad de Sonora (UNISON), Hermosillo, Mexico
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Centro de Investigacion y de Estudios Avanzados del IPN, Mexico City, Mexico
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Universidad Iberoamericana, Mexico City, Mexico
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Benemerita Universidad Autonoma de Puebla, Puebla, Mexico
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Universidad Autónoma de San Luis Potosí, San Luis Potosí, Mexico
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University of Auckland, Auckland, New Zealand
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University of Canterbury, Christchurch, New Zealand
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National Centre for Physics, Quaid-I-Azam University, Islamabad, Pakistan
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National Centre for Nuclear Research, Swierk, Poland
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Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Warsaw, Poland
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Laboratório de Instrumentação e Física Experimental de Partículas, Lisbon, Portugal
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Joint Institute for Nuclear Research, Dubna, Russia
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Petersburg Nuclear Physics Institute, Gatchina (St. Petersburg), Russia
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Institute for Nuclear Research, Moscow, Russia
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Institute for Theoretical and Experimental Physics, Moscow, Russia
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Moscow Institute of Physics and Technology, Moscow, Russia
106
National Research Nuclear University ’Moscow Engineering Physics Institute’ (MEPhI), Moscow, Russia
107
P.N. Lebedev Physical Institute, Moscow, Russia
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Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia
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Novosibirsk State University (NSU), Novosibirsk, Russia
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Institute for High Energy Physics of National Research Centre ’Kurchatov Institute’, Protvino, Russia
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National Research Tomsk Polytechnic University, Tomsk, Russia
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Faculty of Physics and VINCA Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia
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Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT), Madrid, Spain
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Universidad Autónoma de Madrid, Madrid, Spain
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Universidad de Oviedo, Oviedo, Spain
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Instituto de Física de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander, Spain
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Department of Physics, University of Ruhuna, Matara, Sri Lanka
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CERN, European Organization for Nuclear Research, Geneva, Switzerland
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Paul Scherrer Institut, Villigen, Switzerland
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ETH Zurich-Institute for Particle Physics and Astrophysics (IPA), Zurich, Switzerland
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Universität Zürich, Zurich, Switzerland
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National Central University, Chung-Li, Taiwan
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National Taiwan University (NTU), Taipei, Taiwan
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Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
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Physics Department, Science and Art Faculty, Çukurova University, Adana, Turkey
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Physics Department, Middle East Technical University, Ankara, Turkey
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Bogazici University, Istanbul, Turkey
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Istanbul Technical University, Istanbul, Turkey
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Institute for Scintillation Materials of National Academy of Science of Ukraine, Kharkov, Ukraine
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National Scientific Center, Kharkov Institute of Physics and Technology, Kharkov, Ukraine
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University of Bristol, Bristol, United Kingdom
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Rutherford Appleton Laboratory, Didcot, United Kingdom
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Imperial College, London, United Kingdom
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Brunel University, Uxbridge, United Kingdom
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Baylor University, Waco, USA
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Catholic University of America, Washington DC, USA
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The University of Alabama, Tuscaloosa, USA
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Boston University, Boston, USA
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Brown University, Providence, USA
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University of California, Davis, Davis, USA
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University of California, Los Angeles, USA
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University of California, Riverside, Riverside, USA
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University of California, San Diego, La Jolla, USA
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Department of Physics, University of California, Santa Barbara, Santa Barbara, USA
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California Institute of Technology, Pasadena, USA
146
Carnegie Mellon University, Pittsburgh, USA
147
University of Colorado Boulder, Boulder, USA
148
Cornell University, Ithaca, USA
149
Fermi National Accelerator Laboratory, Batavia, USA
150
University of Florida, Gainesville, USA
151
Florida International University, Miami, USA
152
Florida State University, Tallahassee, USA
153
Florida Institute of Technology, Melbourne, USA
154
University of Illinois at Chicago (UIC), Chicago, USA
155
The University of Iowa, Iowa City, USA
156
Johns Hopkins University, Baltimore, USA
157
The University of Kansas, Lawrence, USA
158
Kansas State University, Manhattan, USA
159
Lawrence Livermore National Laboratory, Livermore, USA
160
University of Maryland, College Park, USA
161
Massachusetts Institute of Technology, Cambridge, USA
162
University of Minnesota, Minneapolis, USA
163
University of Mississippi, Oxford, USA
164
University of Nebraska-Lincoln, Lincoln, USA
165
State University of New York at Buffalo, Buffalo, USA
166
Northeastern University, Boston, USA
167
Northwestern University, Evanston, USA
168
University of Notre Dame, Notre Dame, USA
169
The Ohio State University, Columbus, USA
170
Princeton University, Princeton, USA
171
University of Puerto Rico, Mayagüez, USA
172
Purdue University, West Lafayette, USA
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Purdue University Northwest, Hammond, USA
174
Rice University, Houston, USA
175
University of Rochester, Rochester, USA
176
Rutgers, The State University of New Jersey, Piscataway, USA
177
University of Tennessee, Knoxville, USA
178
Texas A&M University, College Station, USA
179
Texas Tech University, Lubbock, USA
180
Vanderbilt University, Nashville, USA
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University of Virginia, Charlottesville, USA
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Wayne State University, Detroit, USA
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University of Wisconsin-Madison, Madison, WI, USA
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CERN, 1211, Geneva 23, Switzerland
* e-mail: cms-publication-committee-chair@cern.ch
Received:
26
March
2019
Accepted:
10
October
2019
Published online:
1
November
2019
A search for new physics in top quark production is performed in proton-proton collisions at 
. The data set corresponds to an integrated luminosity of 
collected in 2016 with the CMS detector. Events with two opposite-sign isolated leptons (electrons or muons), and 
quark jets in the final state are selected. The search is sensitive to new physics in top quark pair production and in single top quark production in association with a 
boson. No significant deviation from the standard model expectation is observed. Results are interpreted in the framework of effective field theory and constraints on the relevant effective couplings are set, one at a time, using a dedicated multivariate analysis. This analysis differs from previous searches for new physics in the top quark sector by explicitly separating 
from 
events and exploiting the specific sensitivity of the process to new physics.
© CERN for the benefit of the CMS collaboration, 2019
