https://doi.org/10.1140/epjc/s10052-014-2974-4
Regular Article - Experimental Physics
Measurement of quarkonium production at forward rapidity in pp collisions at √s = 7 TeV
1
A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute) Foundation, Yerevan, Armenia
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Benemérita Universidad Autónoma de Puebla, Puebla, Mexico
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Bogolyubov Institute for Theoretical Physics, Kiev, Ukraine
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Department of Physics and Centre for Astroparticle Physics and Space Science (CAPSS), Bose Institute, Kolkata, India
5
Budker Institute for Nuclear Physics, Novosibirsk, Russia
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California Polytechnic State University, San Luis Obispo, CA, USA
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Central China Normal University, Wuhan, China
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Centre de Calcul de l’IN2P3, Villeurbanne, France
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Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN), Havana, Cuba
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Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT), Madrid, Spain
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Centro de Investigación y de Estudios Avanzados (CINVESTAV), Mexico City and Mérida, Mexico
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Centro Fermi-Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi”, Rome, Italy
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Chicago State University, Chicago, USA
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Commissariat à l’Energie Atomique, IRFU, Saclay, France
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COMSATS Institute of Information Technology (CIIT), Islamabad, Pakistan
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Departamento de Física de Partículas and IGFAE, Universidad de Santiago de Compostela, Santiago de Compostela, Spain
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Department of Physics and Technology, University of Bergen, Bergen, Norway
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Department of Physics, Aligarh Muslim University, Aligarh, India
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Department of Physics, Ohio State University, Columbus, OH, USA
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Department of Physics, Sejong University, Seoul, South Korea
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Department of Physics, University of Oslo, Oslo, Norway
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Dipartimento di Fisica dell’Università ’La Sapienza’ and Sezione INFN, Rome, Italy
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Dipartimento di Fisica dell’Università and Sezione INFN, Cagliari, Italy
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Dipartimento di Fisica dell’Università and Sezione INFN, Trieste, Italy
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Dipartimento di Fisica dell’Università and Sezione INFN, Turin, Italy
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Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN, Bologna, Italy
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Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN, Catania, Italy
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Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN, Padua, Italy
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Dipartimento di Fisica ‘E.R. Caianiello’ dell’Università and Gruppo Collegato INFN, Salerno, Italy
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Dipartimento di Scienze e Innovazione Tecnologica dell’Università del Piemonte Orientale and Gruppo Collegato INFN, Alessandria, Italy
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Dipartimento Interateneo di Fisica ‘M. Merlin’ and Sezione INFN, Bari, Italy
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Division of Experimental High Energy Physics, University of Lund, Lund, Sweden
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Eberhard Karls Universität Tübingen, Tübingen, Germany
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European Organization for Nuclear Research (CERN), Geneva, Switzerland
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Faculty of Engineering, Bergen University College, Bergen, Norway
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Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovakia
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Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic
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Faculty of Science, P.J. Šafárik University, Košice, Slovakia
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Frankfurt Institute for Advanced Studies, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany
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Gangneung-Wonju National University, Gangneung, South Korea
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Department of Physics, Gauhati University, Guwahati, India
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Helsinki Institute of Physics (HIP), Helsinki, Finland
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Hiroshima University, Hiroshima, Japan
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Indian Institute of Technology Bombay (IIT), Mumbai, India
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Indian Institute of Technology Indore (IITI), Indore, India
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Institut de Physique Nucléaire d’Orsay (IPNO), Université Paris-Sud, CNRS-IN2P3, Orsay, France
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Institut für Informatik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany
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Institut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany
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Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Münster, Germany
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Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg, CNRS-IN2P3, Strasbourg, France
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Institute for Nuclear Research, Academy of Sciences, Moscow, Russia
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Institute for Subatomic Physics of Utrecht University, Utrecht, Netherlands
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Institute for Theoretical and Experimental Physics, Moscow, Russia
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Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovakia
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Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
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Institute of Physics, Bhubaneswar, India
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Institute of Space Science (ISS), Bucharest, Romania
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Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Mexico City, Mexico
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Instituto de Física, Universidad Nacional Autónoma de México, Mexico City, Mexico
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iThemba LABS, National Research Foundation, Somerset West, South Africa
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Joint Institute for Nuclear Research (JINR), Dubna, Russia
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Korea Institute of Science and Technology Information, Taejon, South Korea
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KTO Karatay University, Konya, Turkey
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Laboratoire de Physique Corpusculaire (LPC), Clermont Université, Université Blaise Pascal, CNRS-IN2P3, Clermont-Ferrand, France
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Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS-IN2P3, Grenoble, France
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Laboratori Nazionali di Frascati, INFN, Frascati, Italy
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Laboratori Nazionali di Legnaro, INFN, Legnaro, Italy
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Lawrence Berkeley National Laboratory, Berkeley, CA, USA
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Lawrence Livermore National Laboratory, Livermore, CA, USA
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Moscow Engineering Physics Institute, Moscow, Russia
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National Centre for Nuclear Studies, Warsaw, Poland
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National Institute for Physics and Nuclear Engineering, Bucharest, Romania
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National Institute of Science Education and Research, Bhubaneswar, India
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Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
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Nikhef, National Institute for Subatomic Physics, Amsterdam, The Netherlands
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Nuclear Physics Group, STFC Daresbury Laboratory, Daresbury, UK
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Nuclear Physics Institute, Academy of Sciences of the Czech Republic, Řež u Prahy, Czech Republic
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Oak Ridge National Laboratory, Oak Ridge, TN, USA
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Petersburg Nuclear Physics Institute, Gatchina, Russia
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Physics Department, Creighton University, Omaha, NE, USA
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Physics Department, Panjab University, Chandigarh, India
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Physics Department, University of Athens, Athens, Greece
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Physics Department, University of Cape Town, Cape Town, South Africa
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Physics Department, University of Jammu, Jammu, India
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Physics Department, University of Rajasthan, Jaipur, India
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Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
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Politecnico di Torino, Turin, Italy
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Purdue University, West Lafayette, IN, USA
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Pusan National University, Pusan, South Korea
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Research Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
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Rudjer Bošković Institute, Zagreb, Croatia
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Russian Federal Nuclear Center (VNIIEF), Sarov, Russia
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Russian Research Centre Kurchatov Institute, Moscow, Russia
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Saha Institute of Nuclear Physics, Kolkata, India
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School of Physics and Astronomy, University of Birmingham, Birmingham, UK
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Sección Física, Departamento de Ciencias, Pontificia Universidad Católica del Perú, Lima, Peru
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Sezione INFN, Bari, Italy
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Sezione INFN, Bologna, Italy
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Sezione INFN, Cagliari, Italy
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Sezione INFN, Catania, Italy
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Sezione INFN, Padua, Italy
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Sezione INFN, Rome, Italy
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Sezione INFN, Trieste, Italy
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Sezione INFN, Turin, Italy
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SSC IHEP of NRC Kurchatov institute, Protvino, Russia
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SUBATECH, Ecole des Mines de Nantes, Université de Nantes, CNRS-IN2P3, Nantes, France
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Suranaree University of Technology, Nakhon Ratchasima, Thailand
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Technical University of Split FESB, Split, Croatia
109
The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Kracòw, Poland
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Physics Department, The University of Texas at Austin, Austin, TX, USA
111
Universidad Autónoma de Sinaloa, Culiacán, Mexico
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Universidade de São Paulo (USP), São Paulo, Brazil
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Universidade Estadual de Campinas (UNICAMP), Campinas, Brazil
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University of Houston, Houston, TX, USA
115
University of Jyväskylä, Jyväskylä, Finland
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University of Liverpool, Liverpool, UK
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University of Tennessee, Knoxville, TN, USA
118
University of Tokyo, Tokyo, Japan
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University of Tsukuba, Tsukuba, Japan
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University of Zagreb, Zagreb, Croatia
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Université de Lyon, Université Lyon 1, CNRS/IN2P3, IPN-Lyon, Villeurbanne, France
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V. Fock Institute for Physics, St. Petersburg State University, St. Petersburg, Russia
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Variable Energy Cyclotron Centre, Kolkata, India
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Vestfold University College, Tonsberg, Norway
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Warsaw University of Technology, Warsaw, Poland
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Wayne State University, Detroit, MI, USA
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Wigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, Hungary
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Yale University, New Haven, CT, USA
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Yonsei University, Seoul, South Korea
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Zentrum für Technologietransfer und Telekommunikation (ZTT), Fachhochschule Worms, Worms, Germany
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CERN, 1211, Geneva 23, Switzerland
* e-mail: alice-publications@cern.ch
Received:
10
April
2014
Accepted:
9
July
2014
Published online:
13
August
2014
The inclusive production cross sections at forward rapidity of J/ψ, ψ(2S), ϒ(1S) and ϒ(2S) are measured in pp collisions at √s = 7 TeV with the ALICE detector at the LHC. The analysis is based on a data sample corresponding to an integrated luminosity of 1.35 pb-1. Quarkonia are reconstructed in the dimuon-decay channel and the signal yields are evaluated by fitting the µ+ µ- invariant mass distributions. The differential production cross sections are measured as a function of the transverse momentum pT and rapidity y, over the ranges 0<pT<20 GeV/c for J/ψ, 0<pT<12 GeV/c for all other resonances and for 2.5<y<4. The measured cross sections integrated over pT and y, and assuming unpolarized quarkonia, are: σJ/ψ=6.69 ± 0.04 ± 0.63 µb, σψ(2S)=1.13 ± 0.07 ± 0.19 µb, σϒ(1S)=54.2 ± 5.0 ± 6.7 nb and σϒ(2S)=18.4 ± 3.7 ± 2.9 nb, where the first uncertainty is statistical and the second one is systematic. The results are compared to measurements performed by other LHC experiments and to theoretical models.
© SIF and Springer-Verlag Berlin Heidelberg, 2014
