https://doi.org/10.1140/epjc/s10052-015-3644-x
Regular Article - Experimental Physics
Two-particle Bose–Einstein correlations in pp collisions at 
0.9 and 7 TeV measured with the ATLAS detector
1
Department of Physics, University of Adelaide, Adelaide, Australia
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Physics Department, SUNY Albany, Albany, NY, USA
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Department of Physics, University of Alberta, Edmonton, AB, Canada
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Department of Physics, Ankara University, Ankara, Turkey
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Department of Physics, Gazi University, Ankara, Turkey
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Division of Physics, TOBB University of Economics and Technology, Ankara, Turkey
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Turkish Atomic Energy Authority, Ankara, Turkey
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LAPP, CNRS/IN2P3 and Université Savoie Mont Blanc, Annecy-le-Vieux, France
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High Energy Physics Division, Argonne National Laboratory, Argonne, IL, USA
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Department of Physics, University of Arizona, Tucson, AZ, USA
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Department of Physics, The University of Texas at Arlington, Arlington, TX, USA
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Physics Department, University of Athens, Athens, Greece
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Physics Department, National Technical University of Athens, Zografou, Greece
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Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan
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Institut de Física d’Altes Energies and Departament de Física de la Universitat Autònoma de Barcelona, Barcelona, Spain
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Institute of Physics, University of Belgrade, Belgrade, Serbia
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Department for Physics and Technology, University of Bergen, Bergen, Norway
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Physics Division, Lawrence Berkeley National Laboratory and University of California, Berkeley, CA, USA
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Department of Physics, Humboldt University, Berlin, Germany
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Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics, University of Bern, Bern, Switzerland
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School of Physics and Astronomy, University of Birmingham, Birmingham, UK
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Department of Physics, Bogazici University, Istanbul, Turkey
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Department of Physics, Dogus University, Istanbul, Turkey
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Department of Physics Engineering, Gaziantep University, Gaziantep, Turkey
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INFN Sezione di Bologna, Bologna, Italy
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Dipartimento di Fisica e Astronomia, Università di Bologna, Bologna, Italy
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Physikalisches Institut, University of Bonn, Bonn, Germany
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Department of Physics, Boston University, Boston, MA, USA
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Department of Physics, Brandeis University, Waltham, MA, USA
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Universidade Federal do Rio De Janeiro COPPE/EE/IF, Rio de Janeiro, Brazil
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Electrical Circuits Department, Federal University of Juiz de Fora (UFJF), Juiz de Fora, Brazil
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Federal University of Sao Joao del Rei (UFSJ), Sao Joao del Rei, Brazil
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Instituto de Fisica, Universidade de Sao Paulo, São Paulo, Brazil
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Physics Department, Brookhaven National Laboratory, Upton, NY, USA
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National Institute of Physics and Nuclear Engineering, Bucharest, Romania
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Physics Department, National Institute for Research and Development of Isotopic and Molecular Technologies, Cluj Napoca, Romania
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University Politehnica Bucharest, Bucharest, Romania
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West University in Timisoara, Timisoara, Romania
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Departamento de Física, Universidad de Buenos Aires, Buenos Aires, Argentina
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Cavendish Laboratory, University of Cambridge, Cambridge, UK
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Department of Physics, Carleton University, Ottawa, ON, Canada
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CERN, Geneva, Switzerland
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Enrico Fermi Institute, University of Chicago, Chicago, IL, USA
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Departamento de Física, Pontificia Universidad Católica de Chile, Santiago, Chile
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Departamento de Física, Universidad Técnica Federico Santa María, Valparaiso, Chile
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Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
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Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui, China
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Department of Physics, Nanjing University, Nanjing, Jiangsu, China
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School of Physics, Shandong University, Shandong, China
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Shanghai Key Laboratory for Particle Physics and Cosmology, Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China
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Laboratoire de Physique Corpusculaire, Clermont Université and Université Blaise Pascal and CNRS/IN2P3, Clermont-Ferrand, France
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Nevis Laboratory, Columbia University, Irvington, NY, USA
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Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
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INFN Gruppo Collegato di Cosenza, Laboratori Nazionali di Frascati, Frascati, Italy
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Dipartimento di Fisica, Università della Calabria, Rende, Italy
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AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland
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Marian Smoluchowski Institute of Physics, Jagiellonian University, Kraków, Poland
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Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland
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Physics Department, Southern Methodist University, Dallas, TX, USA
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Physics Department, University of Texas at Dallas, Richardson, TX, USA
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DESY, Hamburg and Zeuthen, Germany
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Institut für Experimentelle Physik IV, Technische Universität Dortmund, Dortmund, Germany
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Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, Germany
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Department of Physics, Duke University, Durham, NC, USA
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SUPA-School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK
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INFN Laboratori Nazionali di Frascati, Frascati, Italy
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Fakultät für Mathematik und Physik, Albert-Ludwigs-Universität, Freiburg, Germany
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Section de Physique, Université de Genève, Geneva, Switzerland
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INFN Sezione di Genova, Genoa, Italy
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Dipartimento di Fisica, Università di Genova, Genoa, Italy
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E. Andronikashvili Institute of Physics, Iv. Javakhishvili Tbilisi State University, Tbilisi, Georgia
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High Energy Physics Institute, Tbilisi State University, Tbilisi, Georgia
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II Physikalisches Institut, Justus-Liebig-Universität Giessen, Giessen, Germany
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SUPA-School of Physics and Astronomy, University of Glasgow, Glasgow, UK
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II Physikalisches Institut, Georg-August-Universität, Göttingen, Germany
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Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS/IN2P3, Grenoble, France
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Department of Physics, Hampton University, Hampton, VA, USA
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Laboratory for Particle Physics and Cosmology, Harvard University, Cambridge, MA, USA
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Kirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
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Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
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ZITI Institut für technische Informatik, Ruprecht-Karls-Universität Heidelberg, Mannheim, Germany
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Faculty of Applied Information Science, Hiroshima Institute of Technology, Hiroshima, Japan
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Department of Physics, Indiana University, Bloomington, IN, USA
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Institut für Astro- und Teilchenphysik, Leopold-Franzens-Universität, Innsbruck, Austria
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University of Iowa, Iowa City, IA, USA
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Department of Physics and Astronomy, Iowa State University, Ames, IA, USA
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Joint Institute for Nuclear Research, JINR Dubna, Dubna, Russia
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KEK, High Energy Accelerator Research Organization, Tsukuba, Japan
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Graduate School of Science, Kobe University, Kobe, Japan
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Faculty of Science, Kyoto University, Kyoto, Japan
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Kyoto University of Education, Kyoto, Japan
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Department of Physics, Kyushu University, Fukuoka, Japan
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Instituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, Argentina
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Physics Department, Lancaster University, Lancaster, UK
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INFN Sezione di Lecce, Lecce, Italy
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Dipartimento di Matematica e Fisica, Università del Salento, Lecce, Italy
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Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK
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Department of Physics, Jožef Stefan Institute and University of Ljubljana, Ljubljana, Slovenia
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School of Physics and Astronomy, Queen Mary University of London, London, UK
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Department of Physics, Royal Holloway University of London, Surrey, UK
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Department of Physics and Astronomy, University College London, London, UK
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Louisiana Tech University, Ruston, LA, USA
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Laboratoire de Physique Nucléaire et de Hautes Energies, UPMC and Université Paris-Diderot and CNRS/IN2P3, Paris, France
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Fysiska institutionen, Lunds universitet, Lund, Sweden
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Departamento de Fisica Teorica C-15, Universidad Autonoma de Madrid, Madrid, Spain
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Institut für Physik, Universität Mainz, Mainz, Germany
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School of Physics and Astronomy, University of Manchester, Manchester, UK
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CPPM, Aix-Marseille Université and CNRS/IN2P3, Marseille, France
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Department of Physics, University of Massachusetts, Amherst, MA, USA
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Department of Physics, McGill University, Montreal, QC, Canada
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School of Physics, University of Melbourne, Melbourne, VIC, Australia
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Department of Physics, The University of Michigan, Ann Arbor, MI, USA
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Department of Physics and Astronomy, Michigan State University, East Lansing, MI, USA
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INFN Sezione di Milano, Milan, Italy
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Dipartimento di Fisica, Università di Milano, Milan, Italy
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B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk, Republic of Belarus
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National Scientific and Educational Centre for Particle and High Energy Physics, Minsk, Republic of Belarus
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Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, USA
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Group of Particle Physics, University of Montreal, Montreal, QC, Canada
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P.N. Lebedev Institute of Physics, Academy of Sciences, Moscow, Russia
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Institute for Theoretical and Experimental Physics (ITEP), Moscow, Russia
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National Research Nuclear University MEPhI, Moscow, Russia
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D.V. Skobeltsyn Institute of Nuclear Physics, M.V. Lomonosov Moscow State University, Moscow, Russia
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Fakultät für Physik, Ludwig-Maximilians-Universität München, Munich, Germany
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Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Munich, Germany
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Nagasaki Institute of Applied Science, Nagasaki, Japan
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Graduate School of Science and Kobayashi-Maskawa Institute, Nagoya University, Nagoya, Japan
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INFN Sezione di Napoli, Naples, Italy
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Dipartimento di Fisica, Università di Napoli, Naples, Italy
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Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM, USA
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Institute for Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen/Nikhef, Nijmegen, The Netherlands
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Nikhef National Institute for Subatomic Physics and University of Amsterdam, Amsterdam, The Netherlands
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Department of Physics, Northern Illinois University, De Kalb, IL, USA
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Budker Institute of Nuclear Physics, SB RAS, Novosibirsk, Russia
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Department of Physics, New York University, New York, NY, USA
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Ohio State University, Columbus, OH, USA
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Faculty of Science, Okayama University, Okayama, Japan
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Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, OK, USA
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Department of Physics, Oklahoma State University, Stillwater, OK, USA
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Palacký University, RCPTM, Olomouc, Czech Republic
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Center for High Energy Physics, University of Oregon, Eugene, OR, USA
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LAL, Université Paris-Sud and CNRS/IN2P3, Orsay, France
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Graduate School of Science, Osaka University, Osaka, Japan
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Department of Physics, University of Oslo, Oslo, Norway
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Department of Physics, Oxford University, Oxford, UK
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INFN Sezione di Pavia, Pavia, Italy
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Dipartimento di Fisica, Università di Pavia, Pavia, Italy
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Department of Physics, University of Pennsylvania, Philadelphia, PA, USA
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Petersburg Nuclear Physics Institute, Gatchina, Russia
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INFN Sezione di Pisa, Pisa, Italy
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Dipartimento di Fisica E. Fermi, Università di Pisa, Pisa, Italy
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Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA, USA
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Laboratorio de Instrumentacao e Fisica Experimental de Particulas - LIP, Lisbon, Portugal
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Faculdade de Ciências, Universidade de Lisboa, Lisbon, Portugal
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Department of Physics, University of Coimbra, Coimbra, Portugal
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Centro de Física Nuclear da Universidade de Lisboa, Lisbon, Portugal
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Departamento de Fisica, Universidade do Minho, Braga, Portugal
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Departamento de Fisica Teorica y del Cosmos and CAFPE, Universidad de Granada, Granada, Spain
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Dep Fisica and CEFITEC of Faculdade de Ciencias e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal
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Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
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Czech Technical University in Prague, Prague, Czech Republic
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Faculty of Mathematics and Physics, Charles University in Prague, Prague, Czech Republic
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State Research Center Institute for High Energy Physics, Protvino, Russia
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Particle Physics Department, Rutherford Appleton Laboratory, Didcot, UK
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Physics Department, University of Regina, Regina, SK, Canada
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Ritsumeikan University, Kusatsu, Shiga, Japan
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INFN Sezione di Roma, Rome, Italy
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Dipartimento di Fisica, Sapienza Università di Roma, Rome, Italy
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INFN Sezione di Roma Tor Vergata, Rome, Italy
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Dipartimento di Fisica, Università di Roma Tor Vergata, Rome, Italy
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INFN Sezione di Roma Tre, Rome, Italy
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Dipartimento di Matematica e Fisica, Università Roma Tre, Rome, Italy
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Faculté des Sciences Ain Chock, Réseau Universitaire de Physique des Hautes Energies-Université Hassan II, Casablanca, Morocco
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Centre National de l’Energie des Sciences Techniques Nucleaires, Rabat, Morocco
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Faculté des Sciences Semlalia, Université Cadi Ayyad, LPHEA-Marrakech, Marrakech, Morocco
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Faculté des Sciences, Université Mohamed Premier and LPTPM, Oujda, Morocco
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Faculté des Sciences, Université Mohammed V-Agdal, Rabat, Morocco
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DSM/IRFU (Institut de Recherches sur les Lois Fondamentales de l’Univers), CEA Saclay (Commissariat à l’Energie Atomique et aux Energies Alternatives), Gif-sur-Yvette, France
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Santa Cruz Institute for Particle Physics, University of California Santa Cruz, Santa Cruz, CA, USA
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Department of Physics, University of Washington, Seattle, WA, USA
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Department of Physics and Astronomy, University of Sheffield, Sheffield, UK
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Department of Physics, Shinshu University, Nagano, Japan
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Fachbereich Physik, Universität Siegen, Siegen, Germany
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Department of Physics, Simon Fraser University, Burnaby, BC, Canada
185
SLAC National Accelerator Laboratory, Stanford, CA, USA
186
Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovak Republic
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Department of Subnuclear Physics, Institute of Experimental Physics of the Slovak Academy of Sciences, Kosice, Slovak Republic
188
Department of Physics, University of Cape Town, Cape Town, South Africa
189
Department of Physics, University of Johannesburg, Johannesburg, South Africa
190
School of Physics, University of the Witwatersrand, Johannesburg, South Africa
191
Department of Physics, Stockholm University, Stockholm, Sweden
192
The Oskar Klein Centre, Stockholm, Sweden
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Physics Department, Royal Institute of Technology, Stockholm, Sweden
194
Departments of Physics and Astronomy and Chemistry, Stony Brook University, Stony Brook, NY, USA
195
Department of Physics and Astronomy, University of Sussex, Brighton, UK
196
School of Physics, University of Sydney, Sydney, Australia
197
Institute of Physics, Academia Sinica, Taipei, Taiwan
198
Department of Physics, Technion: Israel Institute of Technology, Haifa, Israel
199
Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel
200
Department of Physics, Aristotle University of Thessaloniki, Thessaloníki, Greece
201
International Center for Elementary Particle Physics and Department of Physics, The University of Tokyo, Tokyo, Japan
202
Graduate School of Science and Technology, Tokyo Metropolitan University, Tokyo, Japan
203
Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
204
Department of Physics, University of Toronto, Toronto, ON, Canada
205
TRIUMF, Vancouver, BC, Canada
206
Department of Physics and Astronomy, York University, Toronto, ON, Canada
207
Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan
208
Department of Physics and Astronomy, Tufts University, Medford, MA, USA
209
Centro de Investigaciones, Universidad Antonio Narino, Bogotá, Colombia
210
Department of Physics and Astronomy, University of California Irvine, Irvine, CA, USA
211
INFN Gruppo Collegato di Udine, Sezione di Trieste, Udine, Italy
212
ICTP, Trieste, Italy
213
Dipartimento di Chimica Fisica e Ambiente, Università di Udine, Udine, Italy
214
Department of Physics, University of Illinois, Urbana, IL, USA
215
Department of Physics and Astronomy, University of Uppsala, Uppsala, Sweden
216
Instituto de Física Corpuscular (IFIC) and Departamento de Física Atómica, Molecular y Nuclear and Departamento de Ingeniería Electrónica and Instituto de Microelectrónica de Barcelona (IMB-CNM), University of Valencia and CSIC, Valencia, Spain
217
Department of Physics, University of British Columbia, Vancouver, BC, Canada
218
Department of Physics and Astronomy, University of Victoria, Victoria, BC, Canada
219
Department of Physics, University of Warwick, Coventry, UK
220
Waseda University, Tokyo, Japan
221
Department of Particle Physics, The Weizmann Institute of Science, Rehovot, Israel
222
Department of Physics, University of Wisconsin, Madison, WI, USA
223
Fakultät für Physik und Astronomie, Julius-Maximilians-Universität, Würzburg, Germany
224
Fachbereich C Physik, Bergische Universität Wuppertal, Wuppertal, Germany
225
Department of Physics, Yale University, New Haven, CT, USA
226
Yerevan Physics Institute, Yerevan, Armenia
227
Centre de Calcul de l’Institut National de Physique Nucléaire et de Physique des Particules (IN2P3), Villeurbanne, France
228
CERN, 1211, Geneva 23, Switzerland
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Received:
2
March
2015
Accepted:
27
August
2015
Published online:
1
October
2015
The paper presents studies of Bose–Einstein Correlations (BEC) for pairs of like-sign charged particles measured in the kinematic range 
100 MeV and 
2.5 in proton collisions at centre-of-mass energies of 0.9 and 7 TeV with the ATLAS detector at the CERN Large Hadron Collider. The integrated luminosities are approximately 7 
b
, 190 b and 12.4 nb for 0.9 TeV, 7 TeV minimum-bias and 7 TeV high-multiplicity data samples, respectively. The multiplicity dependence of the BEC parameters characterizing the correlation strength and the correlation source size are investigated for charged-particle multiplicities of up to 240. A saturation effect in the multiplicity dependence of the correlation source size parameter is observed using the high-multiplicity 7 TeV data sample. The dependence of the BEC parameters on the average transverse momentum of the particle pair is also investigated.
© SIF and Springer-Verlag Berlin Heidelberg, 2015
