https://doi.org/10.1140/epjc/s10052-015-3502-x
Regular Article - Experimental Physics
Measurement of the 
production cross-section in proton–proton collisions via the decay 
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 de Savoie, CNRS/IN2P3, Annecy-Le-Vieux, France
5
LPC, Clermont Université, Université Blaise Pascal, CNRS/IN2P3, 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
Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
10
Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
11
Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
12
School of Physics, University College Dublin, Dublin, Ireland
13
Sezione INFN di Bari, Bari, Italy
14
Sezione INFN di Bologna, Bologna, Italy
15
Sezione INFN di Cagliari, Cagliari, Italy
16
Sezione INFN di Ferrara, Ferrara, Italy
17
Sezione INFN di Firenze, Florence, Italy
18
Laboratori Nazionali dell’INFN di Frascati, Frascati, Italy
19
Sezione INFN di Genova, Genoa, Italy
20
Sezione INFN di Milano Bicocca, Milan, Italy
21
Sezione INFN di Milano, Milan, Italy
22
Sezione INFN di Padova, Padua, Italy
23
Sezione INFN di Pisa, Pisa, Italy
24
Sezione INFN di Roma Tor Vergata, Rome, Italy
25
Sezione INFN di Roma La Sapienza, Rome, Italy
26
Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland
27
Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Kraków, Poland
28
National Center for Nuclear Research (NCBJ), Warsaw, Poland
29
Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
30
Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia
31
Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia
32
Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia
33
Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN), Moscow, Russia
34
Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia
35
Institute for High Energy Physics (IHEP), Protvino, Russia
36
Universitat de Barcelona, Barcelona, Spain
37
Universidad de Santiago de Compostela, Santiago de Compostela, Spain
38
European Organization for Nuclear Research (CERN), Geneva, Switzerland
39
Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
40
Physik-Institut, Universität Zürich, Zurich, Switzerland
41
Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
42
Nikhef National Institute for Subatomic Physics, VU University Amsterdam, Amsterdam, The Netherlands
43
NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
44
Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
45
University of Birmingham, Birmingham, UK
46
H.H. Wills Physics Laboratory, University of Bristol, Bristol, UK
47
Cavendish Laboratory, University of Cambridge, Cambridge, UK
48
Department of Physics, University of Warwick, Coventry, UK
49
STFC Rutherford Appleton Laboratory, Didcot, UK
50
School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK
51
School of Physics and Astronomy, University of Glasgow, Glasgow, UK
52
Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK
53
Imperial College London, London, UK
54
School of Physics and Astronomy, University of Manchester, Manchester, UK
55
Department of Physics, University of Oxford, Oxford, UK
56
Massachusetts Institute of Technology, Cambridge, MA, USA
57
University of Cincinnati, Cincinnati, OH, USA
58
University of Maryland, College Park, MD, USA
59
Syracuse University, Syracuse, NY, USA
60
Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil
61
Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China
62
Institut für Physik, Universität Rostock, Rostock, Germany
63
National Research Centre Kurchatov Institute, Moscow, Russia
64
Instituto de Fisica Corpuscular (IFIC), Universitat de Valencia-CSIC, Valencia, Spain
65
KVI, University of Groningen, Groningen, The Netherlands
66
Celal Bayar University, Manisa, Turkey
* e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Received:
16
September
2014
Accepted:
4
June
2015
Published online:
4
July
2015
Abstract
The production of the 
state in proton-proton collisions is probed via its decay to the 
final state with the LHCb detector, in the rapidity range 
and in the meson transverse-momentum range 
. The cross-section for prompt production of mesons relative to the prompt 
cross-section is measured, for the first time, to be 
at a centre-of-mass energy 
using data corresponding to an integrated luminosity of 0.7 fb
, and 
at 
using 2.0 fb. The uncertainties quoted are, in order, statistical, systematic, and that on the ratio of branching fractions of the and decays to the final state. In addition, the inclusive branching fraction of 
-hadron decays into mesons is measured, for the first time, to be 
, where the third uncertainty includes also the uncertainty on the inclusive branching fraction from -hadron decays. The difference between the and meson masses is determined to be 
.
© SIF and Springer-Verlag Berlin Heidelberg, 2015
