https://doi.org/10.1140/epjc/s10052-012-2025-y
Regular Article - Experimental Physics
Measurement of ϒ 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
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LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
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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
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Sezione INFN di Cagliari, Cagliari, Italy
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Sezione INFN di Ferrara, Ferrara, Italy
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Sezione INFN di Firenze, Firenze, Italy
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Laboratori Nazionali dell’INFN di Frascati, Frascati, Italy
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Sezione INFN di Genova, Genova, Italy
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Sezione INFN di Milano Bicocca, Milano, Italy
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Sezione INFN di Roma Tor Vergata, Roma, Italy
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Sezione INFN di Roma La Sapienza, Roma, Italy
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Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
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AGH University of Science and Technology, Kraków, Poland
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Soltan Institute for Nuclear Studies, Warsaw, Poland
27
Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
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Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia
29
Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia
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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
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Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia
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Institute for High Energy Physics (IHEP), Protvino, Russia
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Universitat de Barcelona, Barcelona, Spain
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Universidad de Santiago de Compostela, Santiago de Compostela, Spain
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European Organization for Nuclear Research (CERN), Geneva, Switzerland
37
Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
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Physik-Institut, Universität Zürich, Zürich, Switzerland
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Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
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Nikhef National Institute for Subatomic Physics and Vrije Universiteit, Amsterdam, The Netherlands
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NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
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Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
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University of Birmingham, Birmingham, United Kingdom
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H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
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Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
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Department of Physics, University of Warwick, Coventry, United Kingdom
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STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
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School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
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School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
50
Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
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Imperial College London, London, United Kingdom
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School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
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Department of Physics, University of Oxford, Oxford, United Kingdom
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Syracuse University, Syracuse, NY, United States
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Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil
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CC-IN2P3, CNRS/IN2P3, Lyon-Villeurbanne, France
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Physikalisches Institut, Universität Rostock, Rostock, Germany
* e-mail: giulia.manca@cern.ch
Received:
29
February
2012
Revised:
20
April
2012
Published online:
7
June
2012
The production of ϒ(1S), ϒ(2S) and ϒ(3S) mesons in proton-proton collisions at the centre-of-mass energy of is studied with the LHCb detector. The analysis is based on a data sample of 25 pb−1 collected at the Large Hadron Collider. The ϒ mesons are reconstructed in the decay mode ϒ→μ + μ − and the signal yields are extracted from a fit to the μ + μ − invariant mass distributions. The differential production cross-sections times dimuon branching fractions are measured as a function of the ϒ transverse momentum p T and rapidity y, over the range p T <15 GeV/c and 2.0<y<4.5. The cross-sections times branching fractions, integrated over these kinematic ranges, are measured to be [Equation not available: see fulltext.] where the first uncertainty is statistical, the second systematic and the third is due to the unknown polarisation of the three ϒ states.
© Springer-Verlag / Società Italiana di Fisica, 2012