https://doi.org/10.1140/epjc/s10052-012-2100-4
Regular Article - Experimental Physics
Measurement of ψ(2S) meson production in pp collisions at 
1
CERN, 1211, Geneva 23, Switzerland
2
Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil
3
Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
4
Center for High Energy Physics, Tsinghua University, Beijing, China
5
LAPP, Université de Savoie, CNRS/IN2P3, Annecy-Le-Vieux, France
6
Clermont Université, Université Blaise Pascal, CNRS/IN2P3, LPC, Clermont-Ferrand, France
7
CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France
8
LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
9
LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France
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, Milano, Italy
22
Sezione INFN di Roma Tor Vergata, Roma, Italy
23
Sezione INFN di Roma La Sapienza, Roma, Italy
24
Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
25
AGH University of Science and Technology, Kraków, Poland
26
Soltan Institute for Nuclear Studies, Warsaw, Poland
27
Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
28
Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia
29
Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia
30
Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia
31
Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN), Moscow, Russia
32
Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia
33
Institute for High Energy Physics (IHEP), Protvino, Russia
34
Universitat de Barcelona, Barcelona, Spain
35
Universidad de Santiago de Compostela, Santiago de Compostela, Spain
36
European Organization for Nuclear Research (CERN), Geneva, Switzerland
37
Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
38
Physik-Institut, Universität Zürich, Zürich, Switzerland
39
Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
40
Nikhef National Institute for Subatomic Physics and Vrije Universiteit, Amsterdam, The Netherlands
41
NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
42
Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
43
University of Birmingham, Birmingham, United Kingdom
44
H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
45
Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
46
Department of Physics, University of Warwick, Coventry, United Kingdom
47
STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
48
School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
49
School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
50
Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
51
Imperial College London, London, United Kingdom
52
School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
53
Department of Physics, University of Oxford, Oxford, United Kingdom
54
Syracuse University, Syracuse, NY, United States
55
Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil
56
CC-IN2P3, CNRS/IN2P3, Lyon-Villeurbanne, France
57
Physikalisches Institut, Universität Rostock, Rostock, Germany
* e-mail: decapua.stefano@gmail.com
Received:
11
April
2012
Revised:
22
May
2012
Published online:
10
August
2012
The differential cross-section for the inclusive production of ψ(2S) mesons in pp collisions at has been measured with the LHCb detector. The data sample corresponds to an integrated luminosity of 36 pb−1. The ψ(2S) mesons are reconstructed in the decay channels ψ(2S)→μ
+
μ
− and ψ(2S)→J/ψπ
+
π
−, with the J/ψ meson decaying into two muons. Results are presented both for promptly produced ψ(2S) mesons and for those originating from b-hadron decays. In the kinematic range p
T(ψ(2S))≤16 GeV/c and 2<y(ψ(2S))≤4.5 we measure [see pdf] where the last uncertainty on the prompt cross-section is due to the unknown ψ(2S) polarization. Recent QCD calculations are found to be in good agreement with our measurements. Combining the present result with the LHCb J/ψ measurements we determine the inclusive branching fraction [see pdf] where the last uncertainty is due to the 
, 
and 
branching fraction uncertainties.
Key words: Systematic Uncertainty / Decay Mode / Primary Vertex / Silicon Strip Detector / LHCb Detector
© CERN for the benefit of the LHCb collaboration, 2012
