https://doi.org/10.1140/epjc/s10052-020-8365-0
Regular Article - Experimental Physics
Search for CP violation in 
decays using model-independent techniques
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
School of Physics State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China
5
University of Chinese Academy of Sciences, Beijing, China
6
Institute Of High Energy Physics (IHEP), Beijing, China
7
Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China
8
Univ. Grenoble Alpes, Univ. 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
LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France
13
I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany
14
Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
15
Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
16
Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
17
School of Physics, University College Dublin, Dublin, Ireland
18
INFN Sezione di Bari, Bari, Italy
19
INFN Sezione di Bologna, Bologna, Italy
20
INFN Sezione di Ferrara, Ferrara, Italy
21
INFN Sezione di Firenze, Florence, Italy
22
INFN Laboratori Nazionali di Frascati, Frascati, Italy
23
INFN Sezione di Genova, Genoa, Italy
24
INFN Sezione di Milano-Bicocca, Milan, Italy
25
INFN Sezione di Milano, Milan, Italy
26
INFN Sezione di Cagliari, Monserrato, Italy
27
INFN Sezione di Padova, Padua, Italy
28
INFN Sezione di Pisa, Pisa, Italy
29
INFN Sezione di Roma Tor Vergata, Rome, Italy
30
INFN Sezione di Roma La Sapienza, Rome, Italy
31
Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
32
Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands
33
Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
34
Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Kraków, Poland
35
CH-1211, Geneva 23, Switzerland
36
Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
37
Petersburg Nuclear Physics Institute NRC Kurchatov Institute (PNPI NRC KI), Gatchina, Russia
38
Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia
39
Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia
40
Institute for Nuclear Research of the Russian Academy of Sciences (INR RAS), Moscow, Russia
41
Yandex School of Data Analysis, Moscow, Russia
42
Budker Institute of Nuclear Physics (SB RAS), Novosibirsk, Russia
43
Institute for High Energy Physics NRC Kurchatov Institute (IHEP NRC KI), Protvino, Russia
44
ICCUB, Universitat de Barcelona, Barcelona, Spain
45
Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
46
Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia-CSIC, Valencia, Spain
47
European Organization for Nuclear Research (CERN), Geneva, Switzerland
48
Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
49
Physik-Institut, Universität Zürich, Zurich, Switzerland
50
NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
51
Institute for Nuclear Research of the National Academy of Sciences (KINR), Kiev, Ukraine
52
University of Birmingham, Birmingham, UK
53
H.H. Wills Physics Laboratory, University of Bristol, Bristol, UK
54
Cavendish Laboratory, University of Cambridge, Cambridge, UK
55
Department of Physics, University of Warwick, Coventry, UK
56
STFC Rutherford Appleton Laboratory, Didcot, UK
57
School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK
58
School of Physics and Astronomy, University of Glasgow, Glasgow, UK
59
Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK
60
Imperial College London, London, UK
61
Department of Physics and Astronomy, University of Manchester, Manchester, UK
62
Department of Physics, University of Oxford, Oxford, UK
63
Massachusetts Institute of Technology, Cambridge, MA, USA
64
University of Cincinnati, Cincinnati, OH, USA
65
University of Maryland, College Park, MD, USA
66
Los Alamos National Laboratory (LANL), Los Alamos, USA
67
Syracuse University, Syracuse, NY, USA
68
Laboratory of Mathematical and Subatomic Physics, Constantine, Algeria
69
Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil
70
Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou, China
71
School of Physics and Technology, Wuhan University, Wuhan, China
72
Departamento de Fisica, Universidad Nacional de Colombia, Bogotá, Colombia
73
Institut für Physik, Universität Rostock, Rostock, Germany
74
Van Swinderen Institute, University of Groningen, Groningen, The Netherlands
75
National Research Centre Kurchatov Institute, Moscow, Russia
76
National University of Science and Technology “MISIS”, Moscow, Russia
77
National Research University Higher School of Economics, Moscow, Russia
78
National Research Tomsk Polytechnic University, Tomsk, Russia
79
University of Michigan, Ann Arbor, USA
Received:
8
June
2020
Accepted:
8
August
2020
Published online:
26
October
2020
A first search for 
violation in the Cabibbo-suppressed decay is performed using both a binned and an unbinned model-independent technique in the Dalitz plot. The studies are based on a sample of proton-proton collision data, corresponding to an integrated luminosity of 
, and collected by the LHCb experiment at centre-of-mass energies of 7 and 
. The data are consistent with the hypothesis of no violation.
© The Author(s) 2020
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