Search for direct top squark pair production in final states with two leptons in s = 13 TeV pp collisions with the ATLAS detector

. 2017 ; 77 (12) : 898. [epub] 20171222

Status PubMed-not-MEDLINE Jazyk angličtina Země Francie Médium print-electronic

Typ dokumentu časopisecké články

Perzistentní odkaz   https://www.medvik.cz/link/pmid31985737

The results of a search for direct pair production of top squarks in events with two opposite-charge leptons (electrons or muons) are reported, using 36.1 fb - 1 of integrated luminosity from proton-proton collisions at s = 13 TeV collected by the ATLAS detector at the Large Hadron Collider. To cover a range of mass differences between the top squark t ~ and lighter supersymmetric particles, four possible decay modes of the top squark are targeted with dedicated selections: the decay t ~ → b χ ~ 1 ± into a b-quark and the lightest chargino with χ ~ 1 ± → W χ ~ 1 0 , the decay t ~ → t χ ~ 1 0 into an on-shell top quark and the lightest neutralino, the three-body decay t ~ → b W χ ~ 1 0 and the four-body decay t ~ → b ℓ ν χ ~ 1 0 . No significant excess of events is observed above the Standard Model background for any selection, and limits on top squarks are set as a function of the t ~ and χ ~ 1 0 masses. The results exclude at 95% confidence level t ~ masses up to about 720 GeV, extending the exclusion region of supersymmetric parameter space covered by previous searches.

2 Physikalisches Institut Georg August Universität Göttingen Germany

2 Physikalisches Institut Justus Liebig Universität Giessen Giessen Germany

Academia Sinica Grid Computing Institute of Physics Academia Sinica Taipei Taiwan

Albert Einstein Center for Fundamental Physics Laboratory for High Energy Physics University of Bern Bern Switzerland

B 1 Stepanov Institute of Physics National Academy of Sciences of Belarus Minsk Republic of Belarus

Budker Institute of Nuclear Physics SB RAS Novosibirsk Russia

Cavendish Laboratory University of Cambridge Cambridge UK

Center for High Energy Physics University of Oregon Eugene OR USA

Centre de Calcul de l'Institut National de Physique Nucléaire et de Physique des Particules Villeurbanne France

Centro de Física Nuclear da Universidade de Lisboa Lisbon Portugal

Centro de Investigaciones Universidad Antonio Narino Bogotá Colombia

CERN Geneva Switzerland

CPPM Aix Marseille Université and CNRS IN2P3 Marseille France

Czech Technical University Prague Prague Czech Republic

D 5 Skobeltsyn Institute of Nuclear Physics M 5 Lomonosov Moscow State University Moscow Russia

Departamento de Física Pontificia Universidad Católica de Chile Santiago Chile

Departamento de Fisica Teorica C 15 Universidad Autonoma de Madrid Madrid Spain

Departamento de Fisica Teorica y del Cosmos Universidad de Granada Granada Spain

Departamento de Física Universidad de Buenos Aires Buenos Aires Argentina

Departamento de Física Universidad Técnica Federico Santa María Valparaiso Chile

Departamento de Fisica Universidade do Minho Braga Portugal

Departement de Physique Nucleaire et Corpusculaire Université de Genève Geneva Switzerland

Department for Physics and Technology University of Bergen Bergen Norway

Department of Experimental Particle Physics Jožef Stefan Institute and Department of Physics University of Ljubljana Ljubljana Slovenia

Department of Modern Physics and State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei Anhui China

Department of Particle Physics The Weizmann Institute of Science Rehovot Israel

Department of Physics Alexandru Ioan Cuza University of Iasi Iasi Romania

Department of Physics and Astronomy Iowa State University Ames IA USA

Department of Physics and Astronomy Key Laboratory for Particle Physics Astrophysics and Cosmology Ministry of Education Shanghai Key Laboratory for Particle Physics and Cosmology Shanghai Jiao Tong University Shanghai Shanghai China

Department of Physics and Astronomy Michigan State University East Lansing MI USA

Department of Physics and Astronomy Tufts University Medford MA USA

Department of Physics and Astronomy University College London London UK

Department of Physics and Astronomy University of California Irvine Irvine CA USA

Department of Physics and Astronomy University of New Mexico Albuquerque NM USA

Department of Physics and Astronomy University of Pittsburgh Pittsburgh PA USA

Department of Physics and Astronomy University of Sheffield Sheffield UK

Department of Physics and Astronomy University of Sussex Brighton UK

Department of Physics and Astronomy University of Uppsala Uppsala Sweden

Department of Physics and Astronomy University of Victoria Victoria BC Canada

Department of Physics and Astronomy York University Toronto ON Canada

Department of Physics Ankara University Ankara Turkey

Department of Physics Aristotle University of Thessaloniki Thessaloníki Greece

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Department of Physics University of Massachusetts Amherst MA USA

Department of Physics University of Oslo Oslo Norway

Department of Physics University of Pennsylvania Philadelphia PA USA

Department of Physics University of Toronto Toronto ON Canada

Department of Physics University of Warwick Coventry UK

Department of Physics University of Washington Seattle WA USA

Department of Physics University of Wisconsin Madison WI USA

Department of Physics Yale University New Haven CT USA

Department of Subnuclear Physics Institute of Experimental Physics of the Slovak Academy of Sciences Kosice Slovak Republic

Department Physik Universität Siegen Siegen Germany

Departments of Physics and Astronomy and Chemistry Stony Brook University Stony Brook NY USA

DESY Hamburg and Zeuthen Germany

Dipartimento di Chimica Fisica e Ambiente Università di Udine Udine Italy

Dipartimento di Fisica e Astronomia Università di Bologna Bologna Italy

Dipartimento di Fisica E Fermi Università di Pisa Pisa Italy

Dipartimento di Fisica Sapienza Università di Roma Rome Italy

Dipartimento di Fisica Università della Calabria Rende Italy

Dipartimento di Fisica Università di Genova Genoa Italy

Dipartimento di Fisica Università di Milano Milan Italy

Dipartimento di Fisica Università di Napoli Naples Italy

Dipartimento di Fisica Università di Pavia Pavia Italy

Dipartimento di Fisica Università di Roma Tor Vergata Rome Italy

Dipartimento di Matematica e Fisica Università del Salento Lecce Italy

Dipartimento di Matematica e Fisica Università Roma Tre Rome Italy

Division of Physics TOBB University of Economics and Technology Ankara Turkey

DSM IRFU Gif sur Yvette France

E Andronikashvili Institute of Physics Iv Javakhishvili Tbilisi State University Tbilisi Georgia

Electrical Circuits Department Federal University of Juiz de Fora Juiz de Fora Brazil

Enrico Fermi Institute University of Chicago Chicago IL USA

Faculdade de Ciências Universidade de Lisboa Lisbon Portugal

Faculté des Sciences Ain Chock Réseau Universitaire de Physique des Hautes Energies Université Hassan 2 Casablanca Morocco

Faculté des Sciences Semlalia Université Cadi Ayyad LPHEA Marrakech Marrakech Morocco

Faculté des Sciences Université Mohamed Premier and LPTPM Oujda Morocco

Faculté des Sciences Université Mohammed 5 Rabat Morocco

Faculty of Applied Information Science Hiroshima Institute of Technology Hiroshima Japan

Faculty of Engineering and Natural Sciences Bahcesehir University Istanbul Turkey

Faculty of Mathematics and Physics Charles University Prague Czech Republic

Faculty of Mathematics Physics and Informatics Comenius University Bratislava Slovak Republic

Faculty of Physics and Applied Computer Science AGH University of Science and Technology Kraków Poland

Faculty of Pure and Applied Sciences and Center for Integrated Research in Fundamental Science and Engineering University of Tsukuba Tsukuba Japan

Faculty of Science Kyoto University Kyoto Japan

Faculty of Science Okayama University Okayama Japan

Fakultät für Mathematik und Naturwissenschaften Fachgruppe Physik Bergische Universität Wuppertal Wuppertal Germany

Fakultät für Mathematik und Physik Albert Ludwigs Universität Freiburg Germany

Fakultät für Physik Ludwig Maximilians Universität München Munich Germany

Fakultät für Physik und Astronomie Julius Maximilians Universität Würzburg Germany

Federal University of Sao Joao del Rei Sao Joao del Rei Brazil

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Graduate School of Science and Kobayashi Maskawa Institute Nagoya University Nagoya Japan

Graduate School of Science and Technology Tokyo Metropolitan University Tokyo Japan

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Graduate School of Science Osaka University Osaka Japan

Group of Particle Physics University of Montreal Montreal QC Canada

High Energy Physics Division Argonne National Laboratory Argonne IL USA

High Energy Physics Institute Tbilisi State University Tbilisi Georgia

Homer L Dodge Department of Physics and Astronomy University of Oklahoma Norman OK USA

Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest Romania

ICTP Trieste Italy

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INFN TIFPA Trento Italy

Institut de Física d'Altes Energies The Barcelona Institute of Science and Technology Barcelona Spain

Institut für Astro und Teilchenphysik Leopold Franzens Universität Innsbruck Austria

Institut für Kern und Teilchenphysik Technische Universität Dresden Dresden Germany

Institut für Physik Universität Mainz Mainz Germany

Institute for Mathematics Astrophysics and Particle Physics Radboud University Nijmegen Nikhef Nijmegen The Netherlands

Institute for Theoretical and Experimental Physics Moscow Russia

Institute of High Energy Physics Chinese Academy of Sciences Beijing China

Institute of Nuclear Physics Polish Academy of Sciences Kraków Poland

Institute of Physics Academia Sinica Taipei Taiwan

Institute of Physics Academy of Sciences of the Czech Republic Prague Czech Republic

Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan

Institute of Physics University of Belgrade Belgrade Serbia

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International Center for Elementary Particle Physics and Department of Physics The University of Tokyo Tokyo Japan

Istanbul Aydin University Istanbul Turkey

Joint Institute for Nuclear Research JINR Dubna Dubna Russia

KEK High Energy Accelerator Research Organization Tsukuba Japan

Kirchhoff Institut für Physik Ruprecht Karls Universität Heidelberg Heidelberg Germany

Kyoto University of Education Kyoto Japan

Laboratoire de Physique Nucléaire et de Hautes Energies UPMC and Université Paris Diderot and CNRS IN2P3 Paris France

Laboratoire de Physique Subatomique et de Cosmologie Université Grenoble Alpes CNRS IN2P3 Grenoble France

Laboratório de Instrumentação e Física Experimental de Partículas LIP Lisbon Portugal

Laboratory for Particle Physics and Cosmology Harvard University Cambridge MA USA

LAL Univ Paris Sud CNRS IN2P3 Université Paris Saclay Orsay France

LAPP CNRS IN2P3 and Université Savoie Mont Blanc Annecy le Vieux France

Lehrstuhl für Experimentelle Physik 4 Technische Universität Dortmund Dortmund Germany

Louisiana Tech University Ruston LA USA

Marian Smoluchowski Institute of Physics Jagiellonian University Kraków Poland

Max Planck Institut für Physik Munich Germany

Nagasaki Institute of Applied Science Nagasaki Japan

National Research Centre Kurchatov Institute B P Konstantinov Petersburg Nuclear Physics Institute St Petersburg Russia

National Research Nuclear University MEPhI Moscow Russia

Nevis Laboratory Columbia University Irvington NY USA

Niels Bohr Institute University of Copenhagen Copenhagen Denmark

Nikhef National Institute for Subatomic Physics University of Amsterdam Amsterdam The Netherlands

Ohio State University Columbus OH USA

Oliver Lodge Laboratory University of Liverpool Liverpool UK

P N Lebedev Physical Institute of the Russian Academy of Sciences Moscow Russia

Palacký University RCPTM Olomouc Czech Republic

Particle Physics Department Rutherford Appleton Laboratory Didcot UK

Physics Department Brookhaven National Laboratory Upton NY USA

Physics Department Lancaster University Lancaster UK

Physics Department National and Kapodistrian University of Athens Athens Greece

Physics Department National Institute for Research and Development of Isotopic and Molecular Technologies Cluj Napoca Romania

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Physics Division Lawrence Berkeley National Laboratory University of California Berkeley CA USA

Physikalisches Institut Ruprecht Karls Universität Heidelberg Heidelberg Germany

Physikalisches Institut University of Bonn Bonn Germany

Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel

Research Center for Advanced Particle Physics and Department of Physics Kyushu University Fukuoka Japan

Research Institute for Nuclear Problems of Byelorussian State University Minsk Republic of Belarus

Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz CA USA

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School of Physics and Astronomy University of Manchester Manchester UK

School of Physics Shandong University Jinan Shandong China

School of Physics University of Melbourne Victoria Australia

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School of Physics University of the Witwatersrand Johannesburg South Africa

SLAC National Accelerator Laboratory Stanford CA USA

State Research Center Institute for High Energy Physics NRC KI Protvino Russia

SUPA School of Physics and Astronomy University of Edinburgh Edinburgh UK

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The Oskar Klein Centre Stockholm Sweden

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Transilvania University of Brasov Brasov Romania

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Université Clermont Auvergne CNRS IN2P3 LPC Clermont Ferrand France

University of Iowa Iowa City IA USA

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