https://doi.org/10.1140/epjc/s10052-023-11759-6
Regular Article - Experimental Physics
Search for 
in 
decays
1
Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil
2
Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
3
Center for High Energy Physics, Tsinghua University, Beijing, China
4
Institute Of High Energy Physics (IHEP), Beijing, China
5
School of Physics State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China
6
University of Chinese Academy of Sciences, Beijing, China
7
Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China
8
Université Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France
9
Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France
10
Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France
11
Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
12
Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France
13
LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France
14
I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany
15
Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
16
Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
17
Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
18
School of Physics, University College Dublin, Dublin, Ireland
19
INFN Sezione di Bari, Bari, Italy
20
INFN Sezione di Bologna, Bologna, Italy
21
INFN Sezione di Ferrara, Ferrara, Italy
22
INFN Sezione di Firenze, Firenze, Italy
23
INFN Laboratori Nazionali di Frascati, Frascati, Italy
24
INFN Sezione di Genova, Genoa, Italy
25
INFN Sezione di Milano, Milan, Italy
26
INFN Sezione di Milano-Bicocca, Milan, Italy
27
INFN Sezione di Cagliari, Monserrato, Italy
28
Università degli Studi di Padova, Università e INFN, Padova, Padua, Italy
29
INFN Sezione di Pisa, Pisa, Italy
30
INFN Sezione di Roma La Sapienza, Rome, Italy
31
INFN Sezione di Roma Tor Vergata, Rome, Italy
32
Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
33
Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands
34
Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Kraków, Poland
35
Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
36
National Center for Nuclear Research (NCBJ), Warsaw, Poland
37
Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
38
Affiliated with an institute covered by a cooperation agreement with CERN, Geneva, Switzerland
39
DS4DS, La Salle, Universitat Ramon Llull, Barcelona, Spain
40
ICCUB, Universitat de Barcelona, Barcelona, Spain
41
Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
42
Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia-CSIC, Valencia, Spain
43
European Organization for Nuclear Research (CERN), Geneva, Switzerland
44
Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
45
Physik-Institut, Universität Zürich, Zurich, Switzerland
46
NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
47
Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
48
University of Birmingham, Birmingham, UK
49
H.H. Wills Physics Laboratory, University of Bristol, Bristol, UK
50
Cavendish Laboratory, University of Cambridge, Cambridge, UK
51
Department of Physics, University of Warwick, Coventry, UK
52
STFC Rutherford Appleton Laboratory, Didcot, UK
53
School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK
54
School of Physics and Astronomy, University of Glasgow, Glasgow, UK
55
Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK
56
Imperial College London, London, UK
57
Department of Physics and Astronomy, University of Manchester, Manchester, UK
58
Department of Physics, University of Oxford, Oxford, UK
59
Massachusetts Institute of Technology, Cambridge, MA, USA
60
University of Cincinnati, Cincinnati, OH, USA
61
University of Maryland, College Park, MD, USA
62
Los Alamos National Laboratory (LANL), Los Alamos, NM, USA
63
Syracuse University, Syracuse, NY, USA
64
School of Physics and Astronomy, Monash University, Melbourne, Australia
65
Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil
66
Physics and Micro Electronic College, Hunan University, Changsha City, China
67
Guangdong Provincial Key Laboratory of Nuclear Science, Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Institute of Quantum Matter, South China Normal University, Guangzhou, China
68
Lanzhou University, Lanzhou, China
69
School of Physics and Technology, Wuhan University, Wuhan, China
70
Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia
71
Universität Bonn, Helmholtz-Institut für Strahlen und Kernphysik, Bonn, Germany
72
Eotvos Lorand University, Budapest, Hungary
73
INFN Sezione di Perugia, Perugia, Italy
74
Van Swinderen Institute, University of Groningen, Groningen, The Netherlands
75
Universiteit Maastricht, Maastricht, The Netherlands
76
Faculty of Material Engineering and Physics, Kraków, Poland
77
Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden
78
University of Michigan, Ann Arbor, MI, USA
79
Universidade de Brasília, Brasília, Brazil
80
Central South U., Changsha, China
81
Hangzhou Institute for Advanced Study, UCAS, Hangzhou, China
82
Excellence Cluster ORIGINS, Munich, Germany
83
Universidad Nacional Autónoma de Honduras, Tegucigalpa, Honduras
84
Università di Bari, Bari, Italy
85
Università di Bologna, Bologna, Italy
86
Università di Cagliari, Cagliari, Italy
87
Università di Ferrara, Ferrara, Italy
88
Università di Firenze, Firenze, Italy
89
Università di Genova, Genoa, Italy
90
Università degli Studi di Milano, Milan, Italy
91
Università di Milano Bicocca, Milan, Italy
92
Università di Modena e Reggio Emilia, Modena, Italy
93
Università di Padova, Padua, Italy
94
Università di Perugia, Perugia, Italy
95
Scuola Normale Superiore, Pisa, Italy
96
Università di Pisa, Pisa, Italy
97
Università della Basilicata, Potenza, Italy
98
Università di Roma Tor Vergata, Rome, Italy
99
Università di Urbino, Urbino, Italy
100
Universidad de Alcalá, Alcalá de Henares, Spain
101
Universidade da Coruña, Coruña, Spain
102
CERN, 1211, Geneva 23, Switzerland
Received:
5
April
2023
Accepted:
24
June
2023
Published online:
26
July
2023
The very rare 
decay is searched for by analysing 
decays. The analysis uses a sample of beauty mesons produced in proton–proton collisions collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9
. The signal signature corresponds to simultaneous peaks in the 
and 
invariant masses. No evidence for an excess of events over background is observed and an upper limit is set on the branching fraction of the decay at 
at 
confidence level. This is the first limit on the branching fraction of decays and the most stringent limit on 
decays to leptonic final states. The analysis is the first search for a rare charm-meson decay exploiting production via beauty decays.
M.-N. Minard: Deceased.
© The Author(s) 2023
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