https://doi.org/10.1140/epjc/s10052-017-4853-2
Regular Article - Experimental Physics
Searches for pair production of third-generation squarks in 
pp collisions
1
Yerevan Physics Institute, Yerevan, Armenia
2
Institut für Hochenergiephysik, Wien, Austria
3
Institute for Nuclear Problems, Minsk, Belarus
4
National Centre for Particle and High Energy Physics, Minsk, Belarus
5
Universiteit Antwerpen, Antwerpen, Belgium
6
Vrije Universiteit Brussel, Brussel, Belgium
7
Université Libre de Bruxelles, Bruxelles, Belgium
8
Ghent University, Ghent, Belgium
9
Université Catholique de Louvain, Louvain-la-Neuve, Belgium
10
Université de Mons, Mons, Belgium
11
Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, Brazil
12
Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
13
Universidade Estadual Paulista , Universidade Federal do ABC, São Paulo, Brazil
14
Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria
15
University of Sofia, Sofia, Bulgaria
16
Beihang University, Beijing, China
17
Institute of High Energy Physics, Beijing, China
18
State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China
19
Universidad de Los Andes, Bogota, Colombia
20
University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, Split, Croatia
21
University of Split, Faculty of Science, Split, Croatia
22
Institute Rudjer Boskovic, Zagreb, Croatia
23
University of Cyprus, Nicosia, Cyprus
24
Charles University, Prague, Czech Republic
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, IN2P3-CNRS, Palaiseau, France
33
Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg, CNRS-IN2P3, 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
38
RWTH Aachen University, I. Physikalisches Institut, Aachen, Germany
39
RWTH Aachen University, III. Physikalisches Institut A, Aachen, Germany
40
RWTH Aachen University, III. Physikalisches Institut B, Aachen, Germany
41
Deutsches Elektronen-Synchrotron, Hamburg, Germany
42
University of Hamburg, Hamburg, Germany
43
Institut für Experimentelle Kernphysik, Karlsruhe, Germany
44
Institute of Nuclear and Particle Physics (INPP), NCSR Demokritos, Aghia Paraskevi, Greece
45
National and Kapodistrian University of Athens, Athens, Greece
46
University of Ioánnina, Ioánnina, Greece
47
MTA-ELTE Lendület CMS Particle and Nuclear Physics Group, Eötvös Loránd University, Budapest, Hungary
48
Wigner Research Centre for Physics, Budapest, Hungary
49
Institute of Nuclear Research ATOMKI, Debrecen, Hungary
50
Institute of Physics, University of Debrecen, Debrecen, Hungary
51
National Institute of Science Education and Research, Bhubaneswar, India
52
Panjab University, Chandigarh, India
53
University of Delhi, Delhi, India
54
Saha Institute of Nuclear Physics, Kolkata, India
55
Indian Institute of Technology Madras, Madras, India
56
Bhabha Atomic Research Centre, Mumbai, India
57
Tata Institute of Fundamental Research-A, Mumbai, India
58
Tata Institute of Fundamental Research-B, Mumbai, India
59
Indian Institute of Science Education and Research (IISER), Pune, India
60
Institute for Research in Fundamental Sciences (IPM), Tehran, Iran
61
University College Dublin, Dublin, Ireland
62
INFN Sezione di Bari , Università di Bari , Politecnico di Bari, Bari, Italy
63
INFN Sezione di Bologna, Università di Bologna, Bologna, Italy
64
INFN Sezione di Catania , Università di Catania, Catania, Italy
65
INFN Sezione di Firenze , Università di Firenze, Firenze, Italy
66
INFN Laboratori Nazionali di Frascati, Frascati, Italy
67
INFN Sezione di Genova , Università di Genova, Genoa, Italy
68
INFN Sezione di Milano-Bicocca , Università di Milano-Bicocca, Milan, Italy
69
INFN Sezione di Napoli , Università di Napoli ’Federico II’ , Napoli, Italy, Università della Basilicata , Potenza, Italy, Università G. Marconi, Rome, Italy
70
INFN Sezione di Padova , Università di Padova , Padova, Italy, Università di Trento, Trento, Italy
71
INFN Sezione di Pavia , Università di Pavia, Pavia, Italy
72
INFN Sezione di Perugia , Università di Perugia, Perugia, Italy
73
INFN Sezione di Pisa , Università di Pisa , Scuola Normale Superiore di Pisa, Pisa, Italy
74
INFN Sezione di Roma , Università di Roma, Rome, Italy
75
INFN Sezione di Torino , Università di Torino , Turin, Italy, Università del Piemonte Orientale, Novara, Italy
76
INFN Sezione di Trieste , Università di Trieste, Trieste, Italy
77
Kyungpook National University, Taegu, Korea
78
Chonbuk National University, Chonju, Korea
79
Chonnam National University, Institute for Universe and Elementary Particles, Kwangju, Korea
80
Hanyang University, Seoul, Korea
81
Korea University, Seoul, Korea
82
Seoul National University, Seoul, Korea
83
University of Seoul, Seoul, Korea
84
Sungkyunkwan University, Suwon, Korea
85
Vilnius University, Vilnius, Lithuania
86
National Centre for Particle Physics, Universiti Malaya, Kuala Lumpur, Malaysia
87
Centro de Investigacion y de Estudios Avanzados del IPN, Mexico City, Mexico
88
Universidad Iberoamericana, Mexico City, Mexico
89
Benemerita Universidad Autonoma de Puebla, Puebla, Mexico
90
Universidad Autónoma de San Luis Potosí, San Luis Potosí, Mexico
91
University of Auckland, Auckland, New Zealand
92
University of Canterbury, Christchurch, New Zealand
93
National Centre for Physics, Quaid-I-Azam University, Islamabad, Pakistan
94
National Centre for Nuclear Research, Swierk, Poland
95
Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Warsaw, Poland
96
Laboratório de Instrumentação e Física Experimental de Partículas, Lisbon, Portugal
97
Joint Institute for Nuclear Research, Dubna, Russia
98
Petersburg Nuclear Physics Institute, Gatchina, St. Petersburg, Russia
99
Institute for Nuclear Research, Moscow, Russia
100
Institute for Theoretical and Experimental Physics, Moscow, Russia
101
Moscow Institute of Physics and Technology, Moscow, Russia
102
National Research Nuclear University ‘Moscow Engineering Physics Institute’ (MEPhI), Moscow, Russia
103
P.N. Lebedev Physical Institute, Moscow, Russia
104
Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia
105
Novosibirsk State University (NSU), Novosibirsk, Russia
106
State Research Center of Russian Federation, Institute for High Energy Physics, Protvino, Russia
107
University of Belgrade, Faculty of Physics and Vinca Institute of Nuclear Sciences, Belgrade, Serbia
108
Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT), Madrid, Spain
109
Universidad Autónoma de Madrid, Madrid, Spain
110
Universidad de Oviedo, Oviedo, Spain
111
Instituto de Física de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander, Spain
112
CERN, European Organization for Nuclear Research, Geneva, Switzerland
113
Paul Scherrer Institut, Villigen, Switzerland
114
Institute for Particle Physics, ETH Zurich, Zurich, Switzerland
115
Universität Zürich, Zurich, Switzerland
116
National Central University, Chung-Li, Taiwan
117
National Taiwan University (NTU), Taipei, Taiwan
118
Chulalongkorn University, Faculty of Science, Department of Physics, Bangkok, Thailand
119
Cukurova University-Physics Department, Science and Art Faculty, Adana, Turkey
120
Middle East Technical University, Physics Department, Ankara, Turkey
121
Bogazici University, Istanbul, Turkey
122
Istanbul Technical University, Istanbul, Turkey
123
Institute for Scintillation Materials of National Academy of Science of Ukraine, Kharkov, Ukraine
124
National Scientific Center, Kharkov Institute of Physics and Technology, Kharkov, Ukraine
125
University of Bristol, Bristol, UK
126
Rutherford Appleton Laboratory, Didcot, UK
127
Imperial College, London, UK
128
Brunel University, Uxbridge, UK
129
Baylor University, Waco, USA
130
Catholic University of America, Washington, DC, USA
131
The University of Alabama, Tuscaloosa, USA
132
Boston University, Boston, USA
133
Brown University, Providence, USA
134
University of California, Davis, Davis, USA
135
University of California, Los Angeles, USA
136
University of California, Riverside, Riverside, USA
137
University of California, San Diego, La Jolla, USA
138
University of California, Santa Barbara-Department of Physics, Santa Barbara, USA
139
California Institute of Technology, Pasadena, USA
140
Carnegie Mellon University, Pittsburgh, USA
141
University of Colorado Boulder, Boulder, USA
142
Cornell University, Ithaca, USA
143
Fairfield University, Fairfield, USA
144
Fermi National Accelerator Laboratory, Batavia, USA
145
University of Florida, Gainesville, USA
146
Florida International University, Miami, USA
147
Florida State University, Tallahassee, USA
148
Florida Institute of Technology, Melbourne, USA
149
University of Illinois at Chicago (UIC), Chicago, USA
150
The University of Iowa, Iowa City, USA
151
Johns Hopkins University, Baltimore, USA
152
The University of Kansas, Lawrence, USA
153
Kansas State University, Manhattan, USA
154
Lawrence Livermore National Laboratory, Livermore, USA
155
University of Maryland, College Park, USA
156
Massachusetts Institute of Technology, Cambridge, USA
157
University of Minnesota, Minneapolis, USA
158
University of Mississippi, Oxford, USA
159
University of Nebraska-Lincoln, Lincoln, USA
160
State University of New York at Buffalo, Buffalo, USA
161
Northeastern University, Boston, USA
162
Northwestern University, Evanston, USA
163
University of Notre Dame, Notre Dame, USA
164
The Ohio State University, Columbus, USA
165
Princeton University, Princeton, USA
166
University of Puerto Rico, Mayaguez, USA
167
Purdue University, West Lafayette, USA
168
Purdue University Calumet, Hammond, USA
169
Rice University, Houston, USA
170
University of Rochester, Rochester, USA
171
Rutgers, The State University of New Jersey, Piscataway, USA
172
University of Tennessee, Knoxville, USA
173
Texas A & M University, College Station, USA
174
Texas Tech University, Lubbock, USA
175
Vanderbilt University, Nashville, USA
176
University of Virginia, Charlottesville, USA
177
Wayne State University, Detroit, USA
178
University of Wisconsin-Madison, Madison, WI, USA
179
CERN, 1211, Geneva 23, Switzerland
* e-mail: cms-publication-committee-chair@cern.ch
Received:
12
December
2016
Accepted:
23
April
2017
Published online:
18
May
2017
Searches are presented for direct production of top or bottom squark pairs in proton–proton collisions at the CERN LHC. Two searches, based on complementary techniques, are performed in all-jet final states that are characterized by a significant imbalance in transverse momentum. An additional search requires the presence of a charged lepton isolated from other activity in the event. The data were collected in 2015 at a centre-of-mass energy of 13 with the CMS detector and correspond to an integrated luminosity of 2.3
. No statistically significant excess of events is found beyond the expected contribution from standard model processes. Exclusion limits are set in the context of simplified models of top or bottom squark pair production. Models with top and bottom squark masses up to 830 and 890
, respectively, are probed for light neutralinos. For models with top squark masses of 675, neutralino masses up to 260 are excluded at 95% confidence level.
© CERN for the benefit of the CMS collaboration, 2017
