https://doi.org/10.1140/epjc/s10052-021-09749-7
Regular Article - Experimental Physics
Search for chargino–neutralino pair production in final states with three leptons and missing transverse momentum in 
TeV pp collisions with the ATLAS detector
1
Department of Physics, University of Adelaide, Adelaide, Australia
2
Department of Physics, University of Alberta, Edmonton, AB, Canada
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Department of Physics, Ankara University, Ankara, Turkey
4
Application and Research Center for Advanced Studies, Istanbul Aydin University, Istanbul, Turkey
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Division of Physics, TOBB University of Economics and Technology, Ankara, Turkey
6
LAPP, Univ. Savoie Mont Blanc, CNRS/IN2P3, Annecy, France
7
High Energy Physics Division, Argonne National Laboratory, Argonne, IL, USA
8
Department of Physics, University of Arizona, Tucson, AZ, USA
9
Department of Physics, University of Texas at Arlington, Arlington, TX, USA
10
Physics Department, National and Kapodistrian University of Athens, Athens, Greece
11
Physics Department, National Technical University of Athens, Zografou, Greece
12
Department of Physics, University of Texas at Austin, Austin, TX, USA
13
Faculty of Engineering and Natural Sciences, Bahcesehir University, Istanbul, Turkey
14
Faculty of Engineering and Natural Sciences, Istanbul Bilgi University, Istanbul, Turkey
15
Department of Physics, Bogazici University, Istanbul, Turkey
16
Department of Physics Engineering, Gaziantep University, Gaziantep, Turkey
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Institut de Física d’Altes Energies (IFAE), Barcelona Institute of Science and Technology, Barcelona, Spain
18
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
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Physics Department, Tsinghua University, Beijing, China
20
Department of Physics, Nanjing University, Nanjing, China
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University of Chinese Academy of Science (UCAS), Beijing, China
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Institute of Physics, University of Belgrade, Belgrade, Serbia
23
Department for Physics and Technology, University of Bergen, Bergen, Norway
24
Physics Division, Lawrence Berkeley National Laboratory and University of California, Berkeley, CA, USA
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Institut für Physik, Humboldt Universität zu Berlin, Berlin, Germany
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Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics, University of Bern, Bern, Switzerland
27
School of Physics and Astronomy, University of Birmingham, Birmingham, UK
28
Facultad de Ciencias y Centro de Investigaciónes, Universidad Antonio Nariño, Bogotá, Colombia
29
Departamento de Física, Universidad Nacional de Colombia, Bogotá, Colombia
30
Dipartimento di Fisica e Astronomia A. Righi, Università di Bologna, Bologna, Italy
31
INFN Sezione di Bologna, Bologna, Italy
32
Physikalisches Institut, Universität Bonn, Bonn, Germany
33
Department of Physics, Boston University, Boston, MA, USA
34
Department of Physics, Brandeis University, Waltham, MA, USA
35
Transilvania University of Brasov, Brasov, Romania
36
Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, Romania
37
Department of Physics, Alexandru Ioan Cuza University of Iasi, Iasi, Romania
38
Physics Department, National Institute for Research and Development of Isotopic and Molecular Technologies, Cluj-Napoca, Romania
39
University Politehnica Bucharest, Bucharest, Romania
40
West University in Timisoara, Timisoara, Romania
41
Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovak Republic
42
Department of Subnuclear Physics, Institute of Experimental Physics of the Slovak Academy of Sciences, Kosice, Slovak Republic
43
Physics Department, Brookhaven National Laboratory, Upton, NY, USA
44
Departamento de Física (FCEN) and IFIBA, Universidad de Buenos Aires and CONICET, Buenos Aires, Argentina
45
California State University, Long Beach, CA, USA
46
Cavendish Laboratory, University of Cambridge, Cambridge, UK
47
Department of Physics, University of Cape Town, Cape Town, South Africa
48
iThemba Labs, Western Cape, South Africa
49
Department of Mechanical Engineering Science, University of Johannesburg, Johannesburg, South Africa
50
National Institute of Physics, University of the Philippines Diliman (Philippines), Quezon, Philippines
51
Department of Physics, University of South Africa, Pretoria, South Africa
52
School of Physics, University of the Witwatersrand, Johannesburg, South Africa
53
Department of Physics, Carleton University, Ottawa, ON, Canada
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Faculté des Sciences Ain Chock, Réseau Universitaire de Physique des Hautes Energies-Université Hassan II, Casablanca, Morocco
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Faculté des Sciences, Université Ibn-Tofail, Kenitra, Morocco
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Faculté des Sciences Semlalia, Université Cadi Ayyad, LPHEA-Marrakech, Marrakech, Morocco
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LPMR, Faculté des Sciences, Université Mohamed Premier, Oujda, Morocco
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Faculté des sciences, Université Mohammed V, Rabat, Morocco
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Mohammed VI Polytechnic University, Ben Guerir, Morocco
60
CERN, Geneva, Switzerland
61
Enrico Fermi Institute, University of Chicago, Chicago, IL, USA
62
LPC, CNRS/IN2P3, Université Clermont Auvergne, Clermont-Ferrand, France
63
Nevis Laboratory, Columbia University, Irvington, NY, USA
64
Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
65
Dipartimento di Fisica, Università della Calabria, Rende, Italy
66
INFN Gruppo Collegato di Cosenza, Laboratori Nazionali di Frascati, Frascati, Italy
67
Physics Department, Southern Methodist University, Dallas, TX, USA
68
Physics Department, University of Texas at Dallas, Richardson, TX, USA
69
National Centre for Scientific Research “Demokritos”, Agia Paraskevi, Greece
70
Department of Physics, Stockholm University, Stockholm, Sweden
71
Oskar Klein Centre, Stockholm, Sweden
72
Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany
73
Lehrstuhl für Experimentelle Physik IV, Technische Universität Dortmund, Dortmund, Germany
74
Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, Germany
75
Department of Physics, Duke University, Durham, NC, USA
76
SUPA-School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK
77
INFN e Laboratori Nazionali di Frascati, Frascati, Italy
78
Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
79
II. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany
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Département de Physique Nucléaire et Corpusculaire, Université de Genève, Geneva, Switzerland
81
Dipartimento di Fisica, Università di Genova, Genoa, Italy
82
INFN Sezione di Genova, Genoa, Italy
83
II. Physikalisches Institut, Justus-Liebig-Universität Giessen, Giessen, Germany
84
SUPA-School of Physics and Astronomy, University of Glasgow, Glasgow, UK
85
LPSC, Université Grenoble Alpes, CNRS/IN2P3, Grenoble INP, Grenoble, France
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Laboratory for Particle Physics and Cosmology, Harvard University, Cambridge, MA, USA
87
Department of Modern Physics and State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei, China
88
Key Laboratory of Particle Physics and Particle Irradiation (MOE), Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, China
89
Key Laboratory for Particle Astrophysics and Cosmology (MOE), SKLPPC, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China
90
Tsung-Dao Lee Institute, Shanghai, China
91
Kirchhoff-Institut für, Physik Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
92
Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
93
Department of Physics, Chinese University of Hong Kong, Shatin, NT, Hong Kong
94
Department of Physics, University of Hong Kong, Hong Kong, China
95
Department of Physics and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
96
Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
97
IJCLab, Université Paris-Saclay, CNRS/IN2P3, 91405, Orsay, France
98
Department of Physics, Indiana University, Bloomington, IN, USA
99
INFN Gruppo Collegato di Udine, Sezione di Trieste, Udine, Italy
100
ICTP, Trieste, Italy
101
Dipartimento Politecnico di Ingegneria e Architettura, Università di Udine, Udine, Italy
102
INFN Sezione di Lecce, Lecce, Italy
103
Dipartimento di Matematica e Fisica, Università del Salento, Lecce, Italy
104
INFN Sezione di Milano, Milan, Italy
105
Dipartimento di Fisica, Università di Milano, Milan, Italy
106
INFN Sezione di Napoli, Naples, Italy
107
Dipartimento di Fisica, Università di Napoli, Naples, Italy
108
INFN Sezione di Pavia, Pavia, Italy
109
Dipartimento di Fisica, Università di Pavia, Pavia, Italy
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INFN Sezione di Pisa, Pisa, Italy
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Dipartimento di Fisica E. Fermi, Università di Pisa, Pisa, Italy
112
INFN Sezione di Roma, Rome, Italy
113
Dipartimento di Fisica, Sapienza Università di Roma, Rome, Italy
114
INFN Sezione di Roma Tor Vergata, Rome, Italy
115
Dipartimento di Fisica, Università di Roma Tor Vergata, Rome, Italy
116
INFN Sezione di Roma Tre, Rome, Italy
117
Dipartimento di Matematica e Fisica, Università Roma Tre, Rome, Italy
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INFN-TIFPA, Trento, Italy
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Università degli Studi di Trento, Trento, Italy
120
Institut für Astro- und Teilchenphysik, Leopold-Franzens-Universität, Innsbruck, Austria
121
University of Iowa, Iowa City, IA, USA
122
Department of Physics and Astronomy, Iowa State University, Ames, IA, USA
123
Joint Institute for Nuclear Research, Dubna, Russia
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Departamento de Engenharia Elétrica, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora, Brazil
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Universidade Federal do Rio De Janeiro COPPE/EE/IF, Rio de Janeiro, Brazil
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Instituto de Física, Universidade de São Paulo, São Paulo, Brazil
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KEK, High Energy Accelerator Research Organization, Tsukuba, Japan
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Graduate School of Science, Kobe University, Kobe, Japan
129
Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Kraków, Poland
130
Marian Smoluchowski Institute of Physics, Jagiellonian University, Kraków, Poland
131
Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
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Faculty of Science, Kyoto University, Kyoto, Japan
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Kyoto University of Education, Kyoto, Japan
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Department of Physics, Research Center for Advanced Particle Physics, Kyushu University, Fukuoka, Japan
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Instituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, Argentina
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Physics Department, Lancaster University, Lancaster, UK
137
Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK
138
Department of Experimental Particle Physics, Jožef Stefan Institute and Department of Physics, University of Ljubljana, Ljubljana, Slovenia
139
School of Physics and Astronomy, Queen Mary University of London, London, UK
140
Department of Physics, Royal Holloway University of London, Egham, UK
141
Department of Physics and Astronomy, University College London, London, UK
142
Louisiana Tech University, Ruston LA, USA
143
Fysiska Institutionen, Lunds Universitet, Lund, Sweden
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Centre de Calcul de l’Institut National de Physique Nucléaire et de Physique des Particules (IN2P3), Villeurbanne, France
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Departamento de Física Teorica C-15 and CIAFF, Universidad Autónoma de Madrid, Madrid, Spain
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Institut für Physik, Universität Mainz, Mainz, Germany
147
School of Physics and Astronomy, University of Manchester, Manchester, UK
148
CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France
149
Department of Physics, University of Massachusetts, Amherst, MA, USA
150
Department of Physics, McGill University, Montreal, QC, Canada
151
School of Physics, University of Melbourne, Victoria, Australia
152
Department of Physics, University of Michigan, Ann Arbor, MI, USA
153
Department of Physics and Astronomy, Michigan State University, East Lansing, MI, USA
154
B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk, Belarus
155
Research Institute for Nuclear Problems of Byelorussian State University, Minsk, Belarus
156
Group of Particle Physics, University of Montreal, Montreal, QC, Canada
157
P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, Russia
158
National Research Nuclear University MEPhI, Moscow, Russia
159
D.V. Skobeltsyn Institute of Nuclear Physics, M.V. Lomonosov Moscow State University, Moscow, Russia
160
Fakultät für Physik, Ludwig-Maximilians-Universität München, Munich, Germany
161
Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Munich, Germany
162
Nagasaki Institute of Applied Science, Nagasaki, Japan
163
Graduate School of Science and Kobayashi-Maskawa Institute, Nagoya University, Nagoya, Japan
164
Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM, USA
165
Institute for Mathematics, Astrophysics and Particle Physics, Radboud University/Nikhef, Nijmegen, The Netherlands
166
Nikhef National Institute for Subatomic Physics and University of Amsterdam, Amsterdam, The Netherlands
167
Department of Physics, Northern Illinois University, DeKalb, IL, USA
168
Budker Institute of Nuclear Physics and NSU, SB RAS, Novosibirsk, Russia
169
Novosibirsk State University, Novosibirsk, Russia
170
Institute for High Energy Physics of the National Research Centre Kurchatov Institute, Protvino, Russia
171
Institute for Theoretical and Experimental Physics named by A.I. Alikhanov of National Research Centre “Kurchatov Institute”;, Moscow, Russia
172
New York University Abu Dhabi, Abu Dhabi, United Arab Emirates
173
United Arab Emirates University, Al Ain, United Arab Emirates
174
University of Sharjah, Sharjah, United Arab Emirates
175
Department of Physics, New York University, New York, NY, USA
176
Ochanomizu University, Bunkyo-ku, Otsuka, Tokyo, Japan
177
Ohio State University, Columbus, OH, USA
178
Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, OK, USA
179
Department of Physics, Oklahoma State University, Stillwater, OK, USA
180
Palacký University, Joint Laboratory of Optics, Olomouc, Czech Republic
181
Institute for Fundamental Science, University of Oregon, Eugene, OR, USA
182
Graduate School of Science, Osaka University, Osaka, Japan
183
Department of Physics, University of Oslo, Oslo, Norway
184
Department of Physics, Oxford University, Oxford, UK
185
LPNHE, Sorbonne Université, Université de Paris CNRS/IN2P3, Paris, France
186
Department of Physics, University of Pennsylvania, Philadelphia, PA, USA
187
Konstantinov Nuclear Physics Institute of National Research Centre “Kurchatov Institute”, PNPI, St. Petersburg, Russia
188
Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA, USA
189
Laboratório de Instrumentação e Física Experimental de Partículas-LIP, Lisbon, Portugal
190
Departamento de Física, Faculdade de Ciências, Universidade de Lisboa, Lisbon, Portugal
191
Departamento de Física, Universidade de Coimbra, Coimbra, Portugal
192
Centro de Física Nuclear da Universidade de Lisboa, Lisbon, Portugal
193
Departamento de Física, Universidade do Minho, Braga, Portugal
194
Departamento de Física Teórica y del Cosmos, Universidad de Granada, Granada, Spain
195
Dep Física and CEFITEC of Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal
196
Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
197
Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic
198
Czech Technical University in Prague, Prague, Czech Republic
199
Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
200
Particle Physics Department, Rutherford Appleton Laboratory, Didcot, UK
201
IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France
202
Santa Cruz Institute for Particle Physics, University of California Santa Cruz, Santa Cruz, CA, USA
203
Departamento de Física, Pontificia Universidad Católica de Chile, Santiago, Chile
204
Universidad de la Serena, La Serena, Chile
205
Department of Physics, Universidad Andres Bello, Santiago, Chile
206
Instituto de Alta Investigación, Universidad de Tarapacá, Arica, Chile
207
Departamento de Física, Universidad Técnica Federico Santa María, Valparaiso, Chile
208
Universidade Federal de São João del Rei (UFSJ), São João del Rei, Brazil
209
Department of Physics, University of Washington, Seattle, WA, USA
210
Department of Physics and Astronomy, University of Sheffield, Sheffield, UK
211
Department of Physics, Shinshu University, Nagano, Japan
212
Department Physik, Universität Siegen, Siegen, Germany
213
Department of Physics, Simon Fraser University, Burnaby, BC, Canada
214
SLAC National Accelerator Laboratory, Stanford, CA, USA
215
Department of Physics, Royal Institute of Technology, Stockholm, Sweden
216
Departments of Physics and Astronomy, Stony Brook University, Stony Brook, NY, USA
217
Department of Physics and Astronomy, University of Sussex, Brighton, UK
218
School of Physics, University of Sydney, Sydney, Australia
219
Institute of Physics, Academia Sinica, Taipei, Taiwan
220
E. Andronikashvili Institute of Physics, Iv. Javakhishvili Tbilisi State University, Tbilisi, Georgia
221
High Energy Physics Institute, Tbilisi State University, Tbilisi, Georgia
222
Department of Physics, Technion, Israel Institute of Technology, Haifa, Israel
223
Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel
224
Department of Physics, Aristotle University of Thessaloniki, Thessaloníki, Greece
225
International Center for Elementary Particle Physics and Department of Physics, University of Tokyo, Tokyo, Japan
226
Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
227
Tomsk State University, Tomsk, Russia
228
Department of Physics, University of Toronto, Toronto, ON, Canada
229
TRIUMF, Vancouver, BC, Canada
230
Department of Physics and Astronomy, York University, Toronto, ON, Canada
231
Division of Physics and Tomonaga Center for the History of the Universe, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan
232
Department of Physics and Astronomy, Tufts University, Medford, MA, USA
233
Department of Physics and Astronomy, University of California Irvine, Irvine, CA, USA
234
Department of Physics and Astronomy, University of Uppsala, Uppsala, Sweden
235
Department of Physics, University of Illinois, Urbana, IL, USA
236
Instituto de Física Corpuscular (IFIC), Centro Mixto Universidad de Valencia-CSIC, Valencia, Spain
237
Department of Physics, University of British Columbia, Vancouver, BC, Canada
238
Department of Physics and Astronomy, University of Victoria, Victoria, BC, Canada
239
Fakultät für Physik und Astronomie, Julius-Maximilians-Universität Würzburg, Würzburg, Germany
240
Department of Physics, University of Warwick, Coventry, UK
241
Waseda University, Tokyo, Japan
242
Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot, Israel
243
Department of Physics, University of Wisconsin, Madison, WI, USA
244
Fakultät für Mathematik und Naturwissenschaften, Fachgruppe Physik, Bergische Universität Wuppertal, Wuppertal, Germany
245
Department of Physics, Yale University, New Haven, CT, USA
246
Borough of Manhattan Community College, City University of New York, New York, NY, USA
247
Bruno Kessler Foundation, Trento, Italy
248
Center for High Energy Physics, Peking University, Beijing, China
249
Centro Studi e Ricerche Enrico Fermi, Rome, Italy
250
CERN, Geneva, Switzerland
251
CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France
252
Département de Physique Nucléaire et Corpusculaire, Université de Genève, Geneva, Switzerland
253
Departament de Fisica de la Universitat Autonoma de Barcelona, Barcelona, Spain
254
Department of Financial and Management Engineering, University of the Aegean, Chios, Greece
255
Department of Physics and Astronomy, Michigan State University, East Lansing, MI, USA
256
Department of Physics and Astronomy, University of Louisville, Louisville, KY, USA
257
Department of Physics, Ben Gurion University of the Negev, Beer Sheva, Israel
258
Department of Physics, California State University, East Bay, USA
259
Department of Physics, California State University, Fresno, USA
260
Department of Physics, California State University, Sacramento, USA
261
Department of Physics, King’s College London, London, UK
262
Department of Physics, St. Petersburg State Polytechnical University, St. Petersburg, Russia
263
Department of Physics, University of Fribourg, Fribourg, Switzerland
264
Faculty of Physics, M.V. Lomonosov Moscow State University, Moscow, Russia
265
Faculty of Physics, Sofia University, ‘St. Kliment Ohridski’, Sofia, Bulgaria
266
Giresun University, Faculty of Engineering, Giresun, Turkey
267
Graduate School of Science, Osaka University, Osaka, Japan
268
Hellenic Open University, Patras, Greece
269
Institucio Catalana de Recerca i Estudis Avancats, ICREA, Barcelona, Spain
270
Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany
271
Institute for Particle and Nuclear Physics, Wigner Research Centre for Physics, Budapest, Hungary
272
Institute of Particle Physics (IPP), Victoria, Canada
273
Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan
274
Institute of Theoretical Physics, Ilia State University, Tbilisi, Georgia
275
Instituto de Fisica Teorica, IFT-UAM/CSIC, Madrid, Spain
276
Department of Physics, Istanbul University, Istanbul, Turkey
277
Joint Institute for Nuclear Research, Dubna, Russia
278
Moscow Institute of Physics and Technology State University, Dolgoprudny, Russia
279
National Research Nuclear University MEPhI, Moscow, Russia
280
Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
281
The City College of New York, New York, NY, USA
282
TRIUMF, Vancouver, BC, Canada
283
Universita di Napoli Parthenope, Naples, Italy
284
University of Chinese Academy of Sciences (UCAS), Beijing, China
285
Yeditepe University, Physics Department, Istanbul, Turkey
286
CERN, 1211, Geneva 23, Switzerland
Received:
7
June
2021
Accepted:
12
October
2021
Published online:
20
December
2021
A search for chargino–neutralino pair production in three-lepton final states with missing transverse momentum is presented. The study is based on a dataset of TeV pp collisions recorded with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 139 
. No significant excess relative to the Standard Model predictions is found in data. The results are interpreted in simplified models of supersymmetry, and statistically combined with results from a previous ATLAS search for compressed spectra in two-lepton final states. Various scenarios for the production and decay of charginos (
) and neutralinos (
) are considered. For pure higgsino 
pair-production scenarios, exclusion limits at 95% confidence level are set on masses up to 210 GeV. Limits are also set for pure wino pair production, on masses up to 640 GeV for decays via on-shell W and Z bosons, up to 300 GeV for decays via off-shell W and Z bosons, and up to 190 GeV for decays via W and Standard Model Higgs bosons.
© The Author(s) 2021
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