https://doi.org/10.1140/epjc/s10052-016-4250-2
Regular Article - Experimental Physics
A precise measurement of the 
meson oscillation frequency
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
LAPP, Université Savoie Mont-Blanc, CNRS/IN2P3, Annecy-Le-Vieux, France
5
Clermont Université, Université Blaise Pascal, CNRS/IN2P3, LPC, Clermont-Ferrand, France
6
CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France
7
LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
8
LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France
9
I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany
10
Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
11
Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
12
Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
13
School of Physics, University College Dublin, Dublin, Ireland
14
Sezione INFN di Bari, Bari, Italy
15
Sezione INFN di Bologna, Bologna, Italy
16
Sezione INFN di Cagliari, Cagliari, Italy
17
Sezione INFN di Ferrara, Ferrara, Italy
18
Sezione INFN di Firenze, Firenze, Italy
19
Laboratori Nazionali dell’INFN di Frascati, Frascati, Italy
20
Sezione INFN di Genova, Genova, Italy
21
Sezione INFN di Milano Bicocca, Milan, Italy
22
Sezione INFN di Milano, Milan, Italy
23
Sezione INFN di Padova, Padua, Italy
24
Sezione INFN di Pisa, Pisa, Italy
25
Sezione INFN di Roma Tor Vergata, Rome, Italy
26
Sezione INFN di Roma La Sapienza, Rome, Italy
27
Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
28
Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Kraków, Poland
29
National Center for Nuclear Research (NCBJ), Warsaw, Poland
30
Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
31
Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia
32
Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia
33
Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia
34
Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN), Moscow, Russia
35
Budker Institute of Nuclear Physics (SB RAS), Novosibirsk State University, Novosibirsk, Russia
36
Institute for High Energy Physics (IHEP), Protvino, Russia
37
Universitat de Barcelona, Barcelona, Spain
38
Universidad de Santiago de Compostela, Santiago de Compostela, Spain
39
European Organization for Nuclear Research (CERN), Geneva, Switzerland
40
Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
41
Physik-Institut, Universität Zürich, Zurich, Switzerland
42
Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
43
Nikhef National Institute for Subatomic Physics, VU University Amsterdam, Amsterdam, The Netherlands
44
NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
45
Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
46
University of Birmingham, Birmingham, UK
47
H.H. Wills Physics Laboratory, University of Bristol, Bristol, UK
48
Cavendish Laboratory, University of Cambridge, Cambridge, UK
49
Department of Physics, University of Warwick, Coventry, UK
50
STFC Rutherford Appleton Laboratory, Didcot, UK
51
School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK
52
School of Physics and Astronomy, University of Glasgow, Glasgow, UK
53
Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK
54
Imperial College London, London, UK
55
School of Physics and Astronomy, University of Manchester, Manchester, UK
56
Department of Physics, University of Oxford, Oxford, UK
57
Massachusetts Institute of Technology, Cambridge, MA, USA
58
University of Cincinnati, Cincinnati, OH, USA
59
University of Maryland, College Park, MD, USA
60
Syracuse University, Syracuse, NY, USA
61
Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil
62
Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China
63
Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia
64
Institut für Physik, Universität Rostock, Rostock, Germany
65
National Research Centre Kurchatov Institute, Moscow, Russia
66
Yandex School of Data Analysis, Moscow, Russia
67
Instituto de Fisica Corpuscular (IFIC), Universitat de Valencia-CSIC, Valencia, Spain
68
Van Swinderen Institute, University of Groningen, Groningen, The Netherlands
* e-mail: bozzi@fe.infn.it
Received:
13
April
2016
Accepted:
4
July
2016
Published online:
21
July
2016
The oscillation frequency, 
, of mesons is measured using semileptonic decays with a 
or 
meson in the final state. The data sample corresponds to 3.0
of pp collisions, collected by the LHCb experiment at centre-of-mass energies 
= 7 and 8
. A combination of the two decay modes gives 
, where the first uncertainty is statistical and the second is systematic. This is the most precise single measurement of this parameter. It is consistent with the current world average and has similar precision.
© The Author(s), 2016
