https://doi.org/10.1140/epjc/s10052-020-7733-0
Regular Article - Experimental Physics
Measurement of the 
production cross-section in 
collisions at 
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
Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France
6
Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France
7
Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France
8
LAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, France
9
LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France
10
I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany
11
Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
12
Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
13
Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
14
School of Physics, University College Dublin, Dublin, Ireland
15
INFN Sezione di Bari, Bari, Italy
16
INFN Sezione di Bologna, Bologna, Italy
17
INFN Sezione di Ferrara, Ferrara, Italy
18
INFN Sezione di Firenze, Firenze, Italy
19
INFN Laboratori Nazionali di Frascati, Frascati, Italy
20
INFN Sezione di Genova, Genova, Italy
21
INFN Sezione di Milano-Bicocca, Milan, Italy
22
INFN Sezione di Milano, Milan, Italy
23
INFN Sezione di Cagliari, Monserrato, Italy
24
INFN Sezione di Padova, Padua, Italy
25
INFN Sezione di Pisa, Pisa, Italy
26
INFN Sezione di Roma Tor Vergata, Rome, Italy
27
INFN Sezione di Roma La Sapienza, Rome, Italy
28
Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
29
Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands
30
Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
31
AGH-University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland
32
National Center for Nuclear Research (NCBJ), Warsaw, Poland
33
Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
34
Petersburg Nuclear Physics Institute NRC Kurchatov Institute (PNPI NRC KI), Gatchina, Russia
35
Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia, Moscow, Russia
36
Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia
37
Institute for Nuclear Research of the Russian Academy of Sciences (INR RAS), Moscow, Russia
38
Yandex School of Data Analysis, Moscow, Russia
39
National Research University Higher School of Economics, Moscow, Russia
40
Budker Institute of Nuclear Physics (SB RAS), Novosibirsk, Russia
41
Institute for High Energy Physics NRC Kurchatov Institute (IHEP NRC KI), Protvino, Russia, Protvino, Russia
42
ICCUB, Universitat de Barcelona, Barcelona, Spain
43
Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
44
European Organization for Nuclear Research (CERN), Geneva, Switzerland
45
Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
46
Physik-Institut, Universität Zürich, Zürich, Switzerland
47
NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
48
Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
49
University of Birmingham, Birmingham, UK
50
H.H. Wills Physics Laboratory, University of Bristol, Bristol, UK
51
Cavendish Laboratory, University of Cambridge, Cambridge, UK
52
Department of Physics, University of Warwick, Coventry, UK
53
STFC Rutherford Appleton Laboratory, Didcot, UK
54
School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK
55
School of Physics and Astronomy, University of Glasgow, Glasgow, UK
56
Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK
57
Imperial College London, London, UK
58
Department of Physics and Astronomy, University of Manchester, Manchester, UK
59
Department of Physics, University of Oxford, Oxford, UK
60
Massachusetts Institute of Technology, Cambridge, MA, USA
61
University of Cincinnati, Cincinnati, OH, USA
62
University of Maryland, College Park, MD, USA
63
Syracuse University, Syracuse, NY, USA
64
Laboratory of Mathematical and Subatomic Physics, Constantine, Algeria
65
Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil
66
University of Chinese Academy of Sciences, Beijing, China
67
South China Normal University, Guangzhou, China
68
School of Physics and Technology, Wuhan University, Wuhan, China
69
Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China
70
Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia
71
Institut für Physik, Universität Rostock, Rostock, Germany
72
Van Swinderen Institute, University of Groningen, Groningen, The Netherlands
73
National Research Centre Kurchatov Institute, Moscow, Russia
74
National University of Science and Technology “MISIS”, Moscow, Russia
75
National Research Tomsk Polytechnic University, Tomsk, Russia
76
Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia - CSIC, Valencia, Spain
77
University of Michigan, Ann Arbor, USA
78
Los Alamos National Laboratory (LANL), Los Alamos, USA
* e-mail: andrii.usachov@cern.ch
Received:
11
November
2019
Accepted:
9
February
2020
Published online:
2
March
2020
Using a data sample corresponding to an integrated luminosity of 2.0 
, collected by the LHCb experiment, the production of the state in proton–proton collisions at a centre-of-mass energy of 
is studied in the rapidity range 
and in the transverse momentum range 
. The cross-section for prompt production of mesons relative to that of the 
meson is measured using the
decay mode and is found to be 
. The quoted uncertainties are, in order, statistical, systematic and due to uncertainties on the branching fractions of the 
and 
decays. The prompt production cross-section is determined to be 
, where the last uncertainty includes that on the meson cross-section. The ratio of the branching fractions of 
-hadron decays to the and states is measured to be 
, where the last uncertainty is due to those on the branching fractions of the and decays. The difference between the and masses is also determined to be 
, which is the most precise single measurement of this quantity to date.
© CERN for the benefit of the LHCb collaboration, 2020
