https://doi.org/10.1140/epjc/s10052-017-4700-5
Regular Article - Experimental Physics
Search for new phenomena in events containing a same-flavour opposite-sign dilepton pair, jets, and large missing transverse momentum in 
collisions with the ATLAS detector
1
Department of Physics, University of Adelaide, Adelaide, SA, 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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Istanbul Aydin University, Istanbul, Turkey
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Division of Physics, TOBB University of Economics and Technology, 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, National and Kapodistrian University of Athens, Athens, Greece
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Physics Department, National Technical University of Athens, Zografou, Greece
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Department of Physics, The University of Texas at Austin, Austin, TX, USA
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Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan
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Institut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology, 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 Engineering, Gaziantep University, Gaziantep, Turkey
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Istanbul Bilgi University, Faculty of Engineering and Natural Sciences, Istanbul, Turkey
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Bahcesehir University, Faculty of Engineering and Natural Sciences, Istanbul, Turkey
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Centro de Investigaciones, Universidad Antonio Narino, Bogota, Colombia
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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, Sao Paulo, Brazil
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Physics Department, Brookhaven National Laboratory, Upton, NY, USA
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Transilvania University of Brasov, Brasov, Romania
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Horia Hulubei 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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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 Physics, Nanjing University, Jiangsu, China
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Physics Department, Tsinghua University, Beijing, 100084, China
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Department of Modern Physics, University of Science and Technology of China, Anhui, China
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School of Physics, Shandong University, Shandong, China
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Department of Physics and Astronomy, Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai Jiao Tong University (also affiliated with PKU-CHEP), Shanghai, China
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Laboratoire de Physique Corpusculaire, Université Clermont Auvergne niversité Blaise Pascal, 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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Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Krakow, 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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Lehrstuhl 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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Departement de Physique Nucleaire et Corpusculaire, 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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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, The Chinese University of Hong Kong, Shatin, NT, Hong Kong
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Department of Physics, The University of Hong Kong, Hong Kong, China
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Department of Physics and Institute for Advanced Study, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
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Department of Physics, National Tsing Hua University, Hsinchu, Taiwan, Taiwan
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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 Experimental Particle Physics, Jožef Stefan Institute and Department of Physics, 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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Research Institute for Nuclear Problems of Byelorussian State University, Minsk, Republic of Belarus
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Group of Particle Physics, University of Montreal, Montreal, QC, Canada
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P.N. Lebedev Physical Institute of the Russian 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, DeKalb, 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, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 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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National Research Centre “Kurchatov Institute” B.P.Konstantinov Petersburg Nuclear Physics Institute, St. Petersburg, 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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Laboratório de Instrumentação e Física Experimental de Partículas-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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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), NRC KI, Russia
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Particle Physics Department, Rutherford Appleton Laboratory, Didcot, UK
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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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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, 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
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SLAC National Accelerator Laboratory, Stanford, CA, USA
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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
192
Department of Physics, University of Cape Town, Cape Town, South Africa
193
Department of Physics, University of Johannesburg, Johannesburg, South Africa
194
School of Physics, University of the Witwatersrand, Johannesburg, South Africa
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Department of Physics, Stockholm University, Stockholm, Sweden
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The Oskar Klein Centre, Stockholm, Sweden
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Physics Department, Royal Institute of Technology, Stockholm, Sweden
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Departments of Physics and Astronomy and Chemistry, Stony Brook University, Stony Brook, NY, USA
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Department of Physics and Astronomy, University of Sussex, Brighton, UK
200
School of Physics, University of Sydney, Sydney, NSW, Australia
201
Institute of Physics, Academia Sinica, Taipei, Taiwan
202
Department of Physics, Technion: Israel Institute of Technology, Haifa, Israel
203
Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel
204
Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece
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International Center for Elementary Particle Physics and Department of Physics, The University of Tokyo, Tokyo, Japan
206
Graduate School of Science and Technology, Tokyo Metropolitan University, Tokyo, Japan
207
Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
208
Tomsk State University, Tomsk, Russia
209
Department of Physics, University of Toronto, Toronto, ON, Canada
210
INFN-TIFPA, Povo, Italy
211
University of Trento, Trento, Italy
212
TRIUMF, Vancouver, BC, Canada
213
Department of Physics and Astronomy, York University, Toronto, ON, Canada
214
Faculty of Pure and Applied Sciences, and Center for Integrated Research in Fundamental Science and Engineering, University of Tsukuba, Tsukuba, Japan
215
Department of Physics and Astronomy, Tufts University, Medford, MA, USA
216
Department of Physics and Astronomy, University of California Irvine, Irvine, CA, USA
217
INFN Gruppo Collegato di Udine, Sezione di Trieste, Udine, Italy
218
ICTP, Trieste, Italy
219
Dipartimento di Chimica Fisica e Ambiente, Università di Udine, Udine, Italy
220
Department of Physics and Astronomy, University of Uppsala, Uppsala, Sweden
221
Department of Physics, University of Illinois, Urbana, IL, USA
222
Instituto de Fisica Corpuscular (IFIC) and Departamento de Fisica Atomica, Molecular y Nuclear and Departamento de Ingeniería Electrónica and Instituto de Microelectrónica de Barcelona (IMB-CNM), University of Valencia and CSIC, Valencia, Spain
223
Department of Physics, University of British Columbia, Vancouver, BC, Canada
224
Department of Physics and Astronomy, University of Victoria, Victoria, BC, Canada
225
Department of Physics, University of Warwick, Coventry, UK
226
Waseda University, Tokyo, Japan
227
Department of Particle Physics, The Weizmann Institute of Science, Rehovot, Israel
228
Department of Physics, University of Wisconsin, Madison, WI, USA
229
Fakultät für Physik und Astronomie, Julius-Maximilians-Universität, Würzburg, Germany
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Fakultät für Mathematik und Naturwissenschaften, Fachgruppe Physik, Bergische Universität Wuppertal, Wuppertal, Germany
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Department of Physics, Yale University, New Haven, CT, USA
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Yerevan Physics Institute, Yerevan, Armenia
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Centre de Calcul de l’Institut National de Physique Nucléaire et de Physique des Particules (IN2P3), Villeurbanne, France
234
CERN, 1211, Geneva 23, Switzerland
* e-mail: atlas.publications@cern.ch
Received:
18
November
2016
Accepted:
16
February
2017
Published online:
4
March
2017
Two searches for new phenomena in final states containing a same-flavour opposite-sign lepton (electron or muon) pair, jets, and large missing transverse momentum are presented. These searches make use of proton–proton collision data, collected during 2015 and 2016 at a centre-of-mass energy 
by the ATLAS detector at the large hadron collider, which correspond to an integrated luminosity of 
. Both searches target the pair production of supersymmetric particles, squarks or gluinos, which decay to final states containing a same-flavour opposite-sign lepton pair via one of two mechanisms: a leptonically decaying Z boson in the final state, leading to a peak in the dilepton invariant-mass distribution around the Z boson mass; and decays of neutralinos (e.g. 
), yielding a kinematic endpoint in the dilepton invariant-mass spectrum. The data are found to be consistent with the Standard Model expectation. Results are interpreted in simplified models of gluino-pair (squark-pair) production, and provide sensitivity to gluinos (squarks) with masses as large as 1.70 (980 
).
© CERN for the benefit of the ATLAS collaboration, 2017
