Search for the Standard Model Higgs boson produced in association with top quarks and decaying into [Formula: see text] in [Formula: see text] collisions at [Formula: see text] with the ATLAS detector

. 2015 ; 75 (7) : 349. [epub] 20150729

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

Typ dokumentu časopisecké články

Perzistentní odkaz   https://www.medvik.cz/link/pmid26269691

A search for the Standard Model Higgs boson produced in association with a top-quark pair, [Formula: see text], is presented. The analysis uses 20.3 fb-1 of pp collision data at [Formula: see text], collected with the ATLAS detector at the Large Hadron Collider during 2012. The search is designed for the [Formula: see text] decay mode and uses events containing one or two electrons or muons. In order to improve the sensitivity of the search, events are categorised according to their jet and b-tagged jet multiplicities. A neural network is used to discriminate between signal and background events, the latter being dominated by [Formula: see text]+jets production. In the single-lepton channel, variables calculated using a matrix element method are included as inputs to the neural network to improve discrimination of the irreducible [Formula: see text] background. No significant excess of events above the background expectation is found and an observed (expected) limit of 3.4 (2.2) times the Standard Model cross section is obtained at 95 % confidence level. The ratio of the measured [Formula: see text] signal cross section to the Standard Model expectation is found to be [Formula: see text] assuming a Higgs boson mass of 125[Formula: see text].

2 Physikalisches Institut Georg August Universität Göttingen Germany

2 Physikalisches Institut Justus Liebig Universität Giessen Giessen Germany

Albert Einstein Center for Fundamental Physics and 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

Centre National de l'Energie des Sciences Techniques Nucleaires Rabat Morocco

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 and CAFPE 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

Department for Physics and Technology University of Bergen Bergen Norway

Department of Modern Physics University of Science and Technology of China Anhui China

Department of Particle Physics The Weizmann Institute of Science Rehovot Israel

Department of Physics and Astronomy Iowa State University Ames IA USA

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

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

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

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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 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

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

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Dipartimento di Fisica Università di Roma Tor Vergata Rome Italy

Dipartimento di Matematica e Fisica Università del Salento Lecce Italy

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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

Fachbereich C Physik Bergische Universität Wuppertal Wuppertal Germany

Fachbereich Physik Universität Siegen Siegen Germany

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

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Faculté des Sciences Université Mohamed Premier and LPTPM Oujda Morocco

Faculté des Sciences Université Mohammed 5 Agdal Rabat Morocco

Faculty of Applied Information Science Hiroshima Institute of Technology Hiroshima Japan

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Fakultät für Mathematik und Physik Albert Ludwigs Universität Freiburg Germany

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High Energy Physics Division Argonne National Laboratory Argonne IL USA

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Institut de Física d'Altes Energies and Departament de Física de la Universitat Autònoma de Barcelona Barcelona Spain

Institut für Astro und Teilchenphysik Leopold Franzens Universität Innsbruck Austria

Institut für Experimentelle Physik 4 Technische Universität Dortmund Dortmund Germany

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

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Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan

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

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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 Corpusculaire Clermont Université and Université Blaise Pascal and CNRS IN2P3 Clermont Ferrand France

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

Laboratorio de Instrumentacao e Fisica Experimental de Particulas LIP Lisbon Portugal

Laboratory for Particle Physics and Cosmology Harvard University Cambridge MA USA

LAL Université Paris Sud and CNRS IN2P3 Orsay France

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

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

National Institute of Physics and Nuclear Engineering Bucharest Romania

National Research Nuclear University MEPhI Moscow Russia

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Nevis Laboratory Columbia University Irvington NY USA

Niels Bohr Institute University of Copenhagen Copenhagen Denmark

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