https://doi.org/10.1140/epjc/s10052-022-10315-y
Regular Article - Experimental Physics
Observation of B
(2S)K
and B
(2S)K
decays
1
Yerevan Physics Institute, Yerevan, Armenia
2
Institut für Hochenergiephysik, Vienna, Austria
3
Institute for Nuclear Problems, Minsk, Belarus
4
Universiteit Antwerpen, Antwerpen, 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 (a), Universidade Federal do ABC (b), 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
Department of Physics, Tsinghua University, Beijing, China
16
Institute of High Energy Physics, Beijing, China
17
State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China
18
Sun Yat-Sen University, Guangzhou, China
19
Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Fudan University, Shanghai, China
20
Zhejiang University, Hangzhou, China, Zhejiang, China
21
Universidad de Los Andes, Bogota, Colombia
22
Universidad de Antioquia, Medellin, Colombia
23
University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, Split, Croatia
24
University of Split, Faculty of Science, Split, Croatia
25
Institute Rudjer Boskovic, Zagreb, Croatia
26
University of Cyprus, Nicosia, Cyprus
27
Charles University, Prague, Czech Republic
28
Escuela Politecnica Nacional, Quito, Ecuador
29
Universidad San Francisco de Quito, Quito, Ecuador
30
Academy of Scientific Research and Technology of the Arab Republic of Egypt, Egyptian Network of High Energy Physics, Cairo, Egypt
31
Center for High Energy Physics (CHEP-FU), Fayoum University, El-Fayoum, Egypt
32
National Institute of Chemical Physics and Biophysics, Tallinn, Estonia
33
Department of Physics, University of Helsinki, Helsinki, Finland
34
Helsinki Institute of Physics, Helsinki, Finland
35
Lappeenranta University of Technology, Lappeenranta, Finland
36
IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France
37
Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France
38
Université de Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, France
39
Institut de Physique des 2 Infinis de Lyon (IP2I), Villeurbanne, France
40
Georgian Technical University, Tbilisi, Georgia
41
RWTH Aachen University, I. Physikalisches Institut, Aachen, Germany
42
RWTH Aachen University, III. Physikalisches Institut A, Aachen, Germany
43
RWTH Aachen University, III. Physikalisches Institut B, Aachen, Germany
44
Deutsches Elektronen-Synchrotron, Hamburg, Germany
45
University of Hamburg, Hamburg, Germany
46
Karlsruher Institut fuer Technologie, Karlsruhe, Germany
47
Institute of Nuclear and Particle Physics (INPP), NCSR Demokritos, Aghia Paraskevi, Greece
48
National and Kapodistrian University of Athens, Athens, Greece
49
National Technical University of Athens, Athens, Greece
50
University of Ioánnina, Ioánnina, Greece
51
MTA-ELTE Lendület CMS Particle and Nuclear Physics Group, Eötvös Loránd University, Budapest, Hungary
52
Wigner Research Centre for Physics, Budapest, Hungary
53
Institute of Nuclear Research ATOMKI, Debrecen, Hungary
54
Institute of Physics, University of Debrecen, Debrecen, Hungary
55
Karoly Robert Campus, MATE Institute of Technology, Gyongyos, Hungary
56
National Institute of Science Education and Research, HBNI, Bhubaneswar, India
57
Panjab University, Chandigarh, India
58
University of Delhi, Delhi, India
59
Saha Institute of Nuclear Physics, HBNI, Kolkata, India
60
Indian Institute of Technology Madras, Madras, India
61
Bhabha Atomic Research Centre, Mumbai, India
62
Tata Institute of Fundamental Research-A, Mumbai, India
63
Tata Institute of Fundamental Research-B, Mumbai, India
64
Indian Institute of Science Education and Research (IISER), Pune, India
65
Isfahan University of Technology, Isfahan, Iran
66
Institute for Research in Fundamental Sciences (IPM), Tehran, Iran
67
University College Dublin, Dublin, Ireland
68
INFN Sezione di Bari, Università di Bari, Politecnico di Bari, Bari, Italy
69
INFN Sezione di Bologna, Università di Bologna, Bologna, Italy
70
INFN Sezione di Catania, Università di Catania, Catania, Italy
71
INFN Sezione di Firenze, Università di Firenze, Firenze, Italy
72
INFN Laboratori Nazionali di Frascati, Frascati, Italy
73
INFN Sezione di Genova, Università di Genova, Genoa, Italy
74
INFN Sezione di Milano-Bicocca, Università di Milano-Bicocca, Milan, Italy
75
INFN Sezione di Napoli, Università di Napoli ‘Federico II’, Napoli, Italy, Università della Basilicata, Potenza, Italy, Università G. Marconi, Rome, Italy
76
INFN Sezione di Padova, Università di Padova, Padua, Italy, Università di Trento, Trento, Italy
77
INFN Sezione di Pavia, Università di Pavia, Pavia, Italy
78
INFN Sezione di Perugia, Università di Perugia, Perugia, Italy
79
INFN Sezione di Pisa, Università di Pisa, Scuola Normale Superiore di Pisa, Pisa, Italy, Università di Siena, Siena, Italy
80
INFN Sezione di Roma, Sapienza Università di Roma, Rome, Italy
81
INFN Sezione di Torino, Università di Torino, Turin, Italy, Università del Piemonte Orientale, Novara, Italy
82
INFN Sezione di Trieste, Università di Trieste, Trieste, Italy
83
Kyungpook National University, Daegu, Korea
84
Chonnam National University, Institute for Universe and Elementary Particles, Kwangju, Korea
85
Hanyang University, Seoul, Korea
86
Korea University, Seoul, Korea
87
Department of Physics, Kyung Hee University, Seoul, Republic of Korea
88
Sejong University, Seoul, Korea
89
Seoul National University, Seoul, Korea
90
University of Seoul, Seoul, Korea
91
Department of Physics, Yonsei University, Seoul, Korea
92
Sungkyunkwan University, Suwon, Korea
93
College of Engineering and Technology, American University of the Middle East (AUM), Egaila, Kuwait, Dasman, Kuwait
94
Riga Technical University, Riga, Latvia
95
Vilnius University, Vilnius, Lithuania
96
National Centre for Particle Physics, Universiti Malaya, Kuala Lumpur, Malaysia
97
Universidad de Sonora (UNISON), Hermosillo, Mexico
98
Centro de Investigacion y de Estudios Avanzados del IPN, Mexico City, Mexico
99
Universidad Iberoamericana, Mexico City, Mexico
100
Benemerita Universidad Autonoma de Puebla, Puebla, Mexico
101
University of Montenegro, Podgorica, Montenegro
102
University of Auckland, Auckland, New Zealand
103
University of Canterbury, Christchurch, New Zealand
104
National Centre for Physics, Quaid-I-Azam University, Islamabad, Pakistan
105
AGH University of Science and Technology Faculty of Computer Science, Electronics and Telecommunications, Krakow, Poland
106
National Centre for Nuclear Research, Swierk, Poland
107
Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Warsaw, Poland
108
Laboratório de Instrumentaç ao e Física Experimental de Partículas, Lisbon, Portugal
109
Joint Institute for Nuclear Research, Dubna, Russia
110
Petersburg Nuclear Physics Institute, Gatchina (St. Petersburg), Russia
111
Institute for Nuclear Research, Moscow, Russia
112
Institute for Theoretical and Experimental Physics named by A.I. Alikhanov of NRC ‘Kurchatov Institute’, Moscow, Russia
113
Moscow Institute of Physics and Technology, Moscow, Russia
114
National Research Nuclear University ‘Moscow Engineering Physics Institute’ (MEPhI), Moscow, Russia
115
P.N. Lebedev Physical Institute, Moscow, Russia
116
Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia
117
Novosibirsk State University (NSU), Novosibirsk, Russia
118
Institute for High Energy Physics of National Research Centre ‘Kurchatov Institute’, Protvino, Russia
119
National Research Tomsk Polytechnic University, Tomsk, Russia
120
Tomsk State University, Tomsk, Russia
121
University of Belgrade: Faculty of Physics and VINCA Institute of Nuclear Sciences, Belgrade, Serbia
122
Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT), Madrid, Spain
123
Universidad Autónoma de Madrid, Madrid, Spain
124
Universidad de Oviedo, Instituto Universitario de Ciencias y Tecnologías Espaciales de Asturias (ICTEA), Oviedo, Spain
125
Instituto de Física de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander, Spain
126
University of Colombo, Colombo, Sri Lanka
127
Department of Physics, University of Ruhuna, Matara, Sri Lanka
128
CERN, European Organization for Nuclear Research, Geneva, Switzerland
129
Paul Scherrer Institut, Villigen, Switzerland
130
ETH Zurich-Institute for Particle Physics and Astrophysics (IPA), Zurich, Switzerland
131
Universität Zürich, Zurich, Switzerland
132
National Central University, Chung-Li, Taiwan
133
National Taiwan University (NTU), Taipei, Taiwan
134
Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
135
Physics Department, Science and Art Faculty, Çukurova University, Adana, Turkey
136
Physics Department, Middle East Technical University, Ankara, Turkey
137
Bogazici University, Istanbul, Turkey
138
Istanbul Technical University, Istanbul, Turkey
139
Istanbul University, Istanbul, Turkey
140
Institute for Scintillation Materials of National Academy of Science of Ukraine, Kharkov, Ukraine
141
National Scientific Center, Kharkov Institute of Physics and Technology, Kharkov, Ukraine
142
University of Bristol, Bristol, UK
143
Rutherford Appleton Laboratory, Didcot, UK
144
Imperial College, London, UK
145
Brunel University, Uxbridge, UK
146
Baylor University, Waco, TX, USA
147
Catholic University of America, Washington, DC, USA
148
The University of Alabama, Tuscaloosa, AL, USA
149
Boston University, Boston, MA, USA
150
Brown University, Providence, RI, USA
151
University of California, Davis, Davis, CA, USA
152
University of California, Los Angeles, CA, USA
153
University of California, Riverside, Riverside, CA, USA
154
University of California, San Diego, La Jolla, CA, USA
155
Department of Physics, University of California, Santa Barbara, Santa Barbara, CA, USA
156
California Institute of Technology, Pasadena, CA, USA
157
Carnegie Mellon University, Pittsburgh, PA, USA
158
University of Colorado Boulder, Boulder, CO, USA
159
Cornell University, Ithaca, NY, USA
160
Fermi National Accelerator Laboratory, Batavia, IL, USA
161
University of Florida, Gainesville, FL, USA
162
Florida State University, Tallahassee, FL, USA
163
Florida Institute of Technology, Melbourne, FL, USA
164
University of Illinois at Chicago (UIC), Chicago, IL, USA
165
The University of Iowa, Iowa City, IA, USA
166
Johns Hopkins University, Baltimore, MD, USA
167
The University of Kansas, Lawrence, KS, USA
168
Kansas State University, Manhattan, KS, USA
169
Lawrence Livermore National Laboratory, Livermore, CA, USA
170
University of Maryland, College Park, MD, USA
171
Massachusetts Institute of Technology, Cambridge, MA, USA
172
University of Minnesota, Minneapolis, MN, USA
173
University of Nebraska-Lincoln, Lincoln, NE, USA
174
State University of New York at Buffalo, Buffalo, NY, USA
175
Northeastern University, Boston, MA, USA
176
Northwestern University, Evanston, IL, USA
177
University of Notre Dame, Notre Dame, IN, USA
178
The Ohio State University, Columbus, OH, USA
179
Princeton University, Princeton, NJ, USA
180
University of Puerto Rico, Mayaguez, PR, USA
181
Purdue University, West Lafayette, IN, USA
182
Purdue University Northwest, Hammond, IN, USA
183
Rice University, Houston, TX, USA
184
University of Rochester, Rochester, NY, USA
185
The Rockefeller University, New York, NY, USA
186
Rutgers, The State University of New Jersey, Piscataway, NJ, USA
187
University of Tennessee, Knoxville, TN, USA
188
Texas A &M University, College Station, TX, USA
189
Texas Tech University, Lubbock, TX, USA
190
Vanderbilt University, Nashville, TN, USA
191
University of Virginia, Charlottesville, VA, USA
192
Wayne State University, Detroit, MI, USA
193
University of Wisconsin-Madison, Madison, WI, USA
194
TU Wien, Vienna, Austria
195
Institute of Basic and Applied Sciences, Faculty of Engineering, Arab Academy for Science, Technology and Maritime Transport, Alexandria, Egypt
196
Université Libre de Bruxelles, Brussels, Belgium
197
Universidade Estadual de Campinas, Campinas, Brazil
198
Federal University of Rio Grande do Sul, Porto Alegre, Brazil
199
The University of the State of Amazonas, Manaus, Brazil
200
University of Chinese Academy of Sciences, Beijing, China
201
Department of Physics, Tsinghua University, Beijing, China
202
UFMS, Nova Andradina, Brazil
203
Department of Physics, Nanjing Normal University, Nanjing, China
204
The University of Iowa, Iowa City, IA, USA
205
Institute for Theoretical and Experimental Physics named by A.I. Alikhanov of NRC ‘Kurchatov Institute’, Moscow, Russia
206
Joint Institute for Nuclear Research, Dubna, Russia
207
Helwan University, Cairo, Egypt
208
Zewail City of Science and Technology, Zewail, Egypt
209
British University in Egypt, Cairo, Egypt
210
Ain Shams University, Cairo, Egypt
211
Purdue University, West Lafayette, IN, USA
212
Université de Haute Alsace, Mulhouse, France
213
Tbilisi State University, Tbilisi, Georgia
214
Erzincan Binali Yildirim University, Erzincan, Turkey
215
CERN, European Organization for Nuclear Research, Geneva, Switzerland
216
RWTH Aachen University, III. Physikalisches Institut A, Aachen, Germany
217
University of Hamburg, Hamburg, Germany
218
Isfahan University of Technology, Isfahan, Iran
219
Brandenburg University of Technology, Cottbus, Germany
220
Forschungszentrum Jülich, Juelich, Germany
221
Physics Department, Faculty of Science, Assiut University, Assiut, Egypt
222
Karoly Robert Campus, MATE Institute of Technology, Gyongyos, Hungary
223
Institute of Physics, University of Debrecen, Debrecen, Hungary
224
Institute of Nuclear Research ATOMKI, Debrecen, Hungary
225
Universitatea Babes-Bolyai-Facultatea de Fizica, Cluj-Napoca, Romania
226
MTA-ELTE Lendület CMS Particle and Nuclear Physics Group, Eötvös Loránd University, Budapest, Hungary
227
Faculty of Informatics, University of Debrecen, Debrecen, Hungary
228
Wigner Research Centre for Physics, Budapest, Hungary
229
IIT Bhubaneswar, Bhubaneswar, India
230
Institute of Physics, Bhubaneswar, India
231
Punjab Agricultural University, Ludhiana, India
232
UPES-University of Petroleum and Energy Studies, Dehradun, India
233
Shoolini University, Solan, India
234
University of Hyderabad, Hyderabad, India
235
University of Visva-Bharati, Santiniketan, India
236
Indian Institute of Science (IISc), Bangalore, India
237
Indian Institute of Technology (IIT), Mumbai, India
238
Deutsches Elektronen-Synchrotron, Hamburg, Germany
239
Department of Physics, Isfahan University of Technology, Isfahan, Iran
240
Sharif University of Technology, Tehran, Iran
241
Department of Physics, University of Science and Technology of Mazandaran, Behshahr, Iran
242
INFN Sezione di Bari, Università di Bari, Politecnico di Bari, Bari, Italy
243
Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Bologna, Italy
244
Centro Siciliano di Fisica Nucleare e di Struttura Della Materia, Catania, Italy
245
Scuola Superiore Meridionale, Università di Napoli Federico II, Naples, Italy
246
Università di Napoli ‘Federico II’, Naples, Italy
247
Consiglio Nazionale delle Ricerche-Istituto Officina dei Materiali, Perugia, Italy
248
Riga Technical University, Riga, Latvia
249
Consejo Nacional de Ciencia y Tecnología, Mexico City, Mexico
250
IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France
251
Institute for Nuclear Research, Moscow, Russia
252
National Research Nuclear University ‘Moscow Engineering Physics Institute’ (MEPhI), Moscow, Russia
253
Institute of Nuclear Physics of the Uzbekistan Academy of Sciences, Tashkent, Uzbekistan
254
St. Petersburg Polytechnic University, St. Petersburg, Russia
255
University of Florida, Gainesville, Florida, USA
256
Imperial College, London, UK
257
P.N. Lebedev Physical Institute, Moscow, Russia
258
California Institute of Technology, Pasadena, CA, USA
259
Budker Institute of Nuclear Physics, Novosibirsk, Russia
260
Faculty of Physics, University of Belgrade, Belgrade, Serbia
261
Trincomalee Campus, Eastern University, Nilaveli, Sri Lanka
262
INFN Sezione di Pavia, Università di Pavia, Pavia, Italy
263
National and Kapodistrian University of Athens, Athens, Greece
264
Ecole Polytechnique Fédérale Lausanne, Lausanne, Switzerland
265
Universität Zürich, Zurich, Switzerland
266
Stefan Meyer Institute for Subatomic Physics, Vienna, Austria
267
Laboratoire d’Annecy-le-Vieux de Physique des Particules, IN2P3-CNRS, Annecy-le-Vieux, France
268
Şırnak University, Sirnak, Turkey
269
Near East University, Research Center of Experimental Health Science, Nicosia, Turkey
270
Konya Technical University, Konya, Turkey
271
Piri Reis University, Istanbul, Turkey
272
Adiyaman University, Adiyaman, Turkey
273
Necmettin Erbakan University, Konya, Turkey
274
Bozok Universitetesi Rektörlügü, Yozgat, Turkey
275
Marmara University, Istanbul, Turkey
276
Milli Savunma University, Istanbul, Turkey
277
Kafkas University, Kars, Turkey
278
Istanbul Bilgi University, Istanbul, Turkey
279
Hacettepe University, Ankara, Turkey
280
Istanbul University-Cerrahpasa, Faculty of Engineering, Istanbul, Turkey
281
Ozyegin University, Istanbul, Turkey
282
Vrije Universiteit Brussel, Brussels, Belgium
283
School of Physics and Astronomy, University of Southampton, Southampton, UK
284
Rutherford Appleton Laboratory, Didcot, UK
285
IPPP Durham University, Durham, UK
286
Monash University, Faculty of Science, Clayton, Australia
287
Università di Torino, Turin, Italy
288
Bethel University, St. Paul, MN, USA
289
Karamanoğlu Mehmetbey University, Karaman, Turkey
290
United States Naval Academy, Annapolis, MD, USA
291
Bingol University, Bingol, Turkey
292
Georgian Technical University, Tbilisi, Georgia
293
Sinop University, Sinop, Turkey
294
Erciyes University, Kayseri, Turkey
295
Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Fudan University, Shanghai, China
296
Texas A &M University at Qatar, Doha, Qatar
297
Kyungpook National University, Daegu, Korea
298
CERN, 1211, Geneva 23, Switzerland
e
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Received:
22
January
2022
Accepted:
8
April
2022
Published online:
31
May
2022
Abstract
Using a data sample of 
proton-proton collisions collected by the CMS experiment at the LHC in 2017 and 2018 with an integrated luminosity of 
, the 
and 
decays are observed with significances exceeding 5 standard deviations. The resulting branching fraction ratios, measured for the first time, correspond to 
and 
, where the last uncertainty in the first ratio is related to the uncertainty in the ratio of production cross sections of 
and 
mesons, 
.
© The Author(s) 2022
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