https://doi.org/10.1140/epjc/s10052-021-09711-7
Regular Article - Experimental Physics
First measurement of the 
-violating phase 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
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, Milan, Italy
25
INFN Sezione di Milano-Bicocca, Milan, Italy
26
INFN Sezione di Cagliari, Monserrato, Italy
27
Universita degli Studi di Padova, Universita e INFN, Padova, Padua, Italy
28
INFN Sezione di Pisa, Pisa, Italy
29
INFN Sezione di Roma La Sapienza, Rome, Italy
30
INFN Sezione di Roma Tor Vergata, 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
Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Kraków, Poland
34
Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
35
National Center for Nuclear Research (NCBJ), Warsaw, Poland
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 for Nuclear Research of the Russian Academy of Sciences (INR RAS), Moscow, Russia
39
Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia
40
Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), 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), Kyiv, 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
School of Physics and Astronomy, Monash University, Melbourne, Australia
69
Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil
70
Physics and Micro Electronic College, Hunan University, Changsha City, China
71
Guangdong Provencial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou, China
72
School of Physics and Technology, Wuhan University, Wuhan, China
73
Departamento de Fisica, Universidad Nacional de Colombia, Bogotá, Colombia
74
Helmholtz-Institut für Strahlen und Kernphysik, Universität Bonn, Bonn, Germany
75
Institut für Physik, Universität Rostock, Rostock, Germany
76
INFN Sezione di Perugia, Perugia, Italy
77
Van Swinderen Institute, University of Groningen, Groningen, The Netherlands
78
Universiteit Maastricht, Maastricht, The Netherlands
79
National Research Centre Kurchatov Institute, Moscow, Russia
80
National Research University Higher School of Economics, Moscow, Russia
81
National University of Science and Technology “MISIS”, Moscow, Russia
82
National Research Tomsk Polytechnic University, Tomsk, Russia
83
DS4DS, La Salle, Universitat Ramon Llull, Barcelona, Spain
84
University of Michigan, Ann Arbor, USA
85
Universidade Federal do Triângulo Mineiro (UFTM), Uberaba-MG, Brazil
86
Laboratoire Leprince-Ringuet, Palaiseau, France
87
Università di Bari, Bari, Italy
88
Università di Bologna, Bologna, Italy
89
Università di Cagliari, Cagliari, Italy
90
Università di Ferrara, Ferrara, Italy
91
Università di Firenze, Florence, Italy
92
Università di Genova, Genoa, Italy
93
Università degli Studi di Milano, Milan, Italy
94
Università di Milano Bicocca, Milan, Italy
95
Università di Modena e Reggio Emilia, Modena, Italy
96
Università di Padova, Padua, Italy
97
Scuola Normale Superiore, Pisa, Italy
98
Università di Pisa, Pisa, Italy
99
Università della Basilicata, Potenza, Italy
100
Università di Roma Tor Vergata, Rome, Italy
101
Università di Siena, Siena, Italy
102
Università di Urbino, Urbino, Italy
103
MSU-Iligan Institute of Technology (MSU-IIT), Iligan, Philippines
104
Faculty of Computer Science, Electronics and Telecommunications, AGH-University of Science and Technology, Kraków, Poland
105
P.N. Lebedev Physical Institute, Russian Academy of Science (LPI RAS), Moscow, Russia
106
Novosibirsk State University, Novosibirsk, Russia
107
Hanoi University of Science, Hanoi, Vietnam
108
CERN, 1211, Geneva 23, Switzerland
a varvara.batozskaya@ncbj.gov.pl, konrad.klimaszewski@ncbj.gov.pl
Received:
31
May
2021
Accepted:
4
October
2021
Published online:
24
November
2021
A flavour-tagged time-dependent angular analysis of 
decays is presented where the 
meson is reconstructed through its decay to an pair. The analysis uses a sample of pp collision data recorded with the LHCb experiment at centre-of-mass energies of 7 and 
, corresponding to an integrated luminosity of 
. The -violating phase and lifetime parameters of the 
system are measured to be 
, 
and 
where the first uncertainty is statistical and the second systematic. This is the first time that -violating parameters are measured in the decay with an pair in the final state. The results are consistent with previous measurements in other channels and with the Standard Model predictions.
© CERN for the benefit of the LHCb collaboration 2021
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