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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/129593
Title: 
Search for a standard model Higgs boson produced in association with a top-quark pair and decaying to bottom quarks using a matrix element method
Author(s): 
Institution: 
  • Yerevan Phys Inst
  • OeAW
  • Natl Ctr Particle &High Energy Phys
  • Univ Antwerp
  • Vrije Univ Brussel
  • Univ Libre Bruxelles
  • Univ Ghent
  • Catholic Univ Louvain
  • Univ Mons
  • Ctr Brasileiro Pesquisas Fis
  • Universidade do Estado do Rio de Janeiro (UERJ)
  • Universidade Estadual Paulista (UNESP)
  • Universidade Federal do ABC (UFABC)
  • Bulgarian Acad Sci
  • Univ Sofia
  • Inst High Energy Phys
  • Peking Univ
  • Univ Los Andes
  • Univ Split
  • Rudjer Boskovic Inst
  • Univ Cyprus
  • Charles Univ Prague
  • Acad Sci Res &Technol Arab Republ Egypt
  • NICPB
  • Univ Helsinki
  • Helsinki Inst Phys
  • Lappeenranta Univ Technol
  • CEA Saclay
  • Ecole Polytech
  • Univ Haute Alsace Mulhouse
  • Inst Natl Phys Nucl &Phys Particules
  • Univ Lyon 1
  • Tbilisi State Univ
  • Rhein Westfal TH Aachen
  • DESY
  • Univ Hamburg
  • Univ Karlsruhe
  • NCSR Demokritos
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  • Univ Ioannina
  • Wigner Res Ctr Phys
  • Inst Nucl Res ATOMKI
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ISSN: 
1434-6044
Sponsorship: 
  • Austrian Federal Ministry of Science, Research and Economy
  • Austrian Science Fund
  • Belgian Fonds de la Recherche Scientifique
  • Fonds voor Wetenschappelijk Onderzoek
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
  • Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
  • Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)
  • Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
  • Bulgarian Ministry of Education and Science
  • CERN
  • Chinese Academy of Sciences
  • Ministry of Science and Technology
  • National Natural Science Foundation of China
  • Colombian Funding Agency (COLCIENCIAS)
  • Croatian Ministry of Science, Education and Sport
  • Croatian Science Foundation
  • Research Promotion Foundation, Cyprus
  • Ministry of Education and Research
  • Estonian Research Council
  • European Regional Development Fund, Estonia
  • Academy of Finland
  • Finnish Ministry of Education and Culture
  • Helsinki Institute of Physics
  • Institut National de Physique Nucleaire et de Physique des Particules / CNRS
  • Commissariat a l'Energie Atomique et aux Energies Alternatives / CEA, France
  • Bundesministerium fur Bildung und Forschung
  • Deutsche Forschungsgemeinschaft
  • Helmholtz-Gemeinschaft Deutscher Forschungszentren, Germany
  • General Secretariat for Research and Technology, Greece
  • National Scientific Research Foundation
  • National Innovation Office, Hungary
  • Department of Atomic Energy
  • Department of Science and Technology, India
  • Institute for Studies in Theoretical Physics and Mathematics, Iran
  • Science Foundation, Ireland
  • Istituto Nazionale di Fisica Nucleare, Italy
  • Ministry of Science, ICT and Future Planning
  • National Research Foundation (NRF), Republic of Korea
  • Lithuanian Academy of Sciences
  • Ministry of Education
  • University of Malaya (Malaysia)
  • CINVESTAV
  • CONACYT
  • SEP
  • UASLP-FAI
  • Ministry of Business, Innovation and Employment, New Zealand
  • Pakistan Atomic Energy Commission
  • Ministry of Science and Higher Education
  • National Science Centre, Poland
  • Fundacao para a Ciencia e a Tecnologia, Portugal
  • JINR, Dubna
  • Ministry of Education and Science of the Russian Federation
  • Federal Agency of Atomic Energy of the Russian Federation
  • Russian Academy of Sciences
  • Russian Foundation for Basic Research
  • Ministry of Education, Science and Technological Development of Serbia
  • Secretaria de Estado de Investigacion, Desarrollo e Innovacion and Programa Consolider-Ingenio, Spain
  • ETH Board
  • ETH Zurich
  • PSI
  • SNF
  • UniZH
  • Canton Zurich
  • SER
  • Ministry of Science and Technology, Taipei
  • Thailand Center of Excellence in Physics
  • Institute for the Promotion of Teaching Science and Technology of Thailand
  • Special Task Force for Activating Research
  • National Science and Technology Development Agency of Thailand
  • Scientific and Technical Research Council of Turkey
  • Turkish Atomic Energy Authority
  • National Academy of Sciences of Ukraine
  • State Fund for Fundamental Researches, Ukraine
  • Science and Technology Facilities Council, UK
  • US Department of Energy
  • US National Science Foundation
  • Marie-Curie programme
  • European Research Council
  • EPLANET(European Union)
  • Leventis Foundation
  • A. P. Sloan Foundation
  • Alexander von Humboldt Foundation
  • Belgian Federal Science Policy Office
  • Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium)
  • Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium)
  • Ministry of Education, Youth and Sports (MEYS) of the Czech Republic
  • Council of Science and Industrial Research, India
  • HOMING PLUS programme of Foundation for Polish Science
  • European Union, Regional Development Fund
  • Compagnia di San Paolo (Torino)
  • Consorzio per la Fisica (Trieste)
  • MIUR (Italy)
  • Thalis programme
  • Aristeia programme
  • EU-ESF
  • Greek NSRF
  • National Priorities Research Program by Qatar National Research Fund
Sponsorship Process Number: 
  • Estonian Research Council: IUT23-4
  • Estonian Research Council: IUT23-6
  • MIUR (Italy): 20108T4XTM
Abstract: 
A search for a standard model Higgs boson produced in association with a top-quark pair and decaying to bottom quarks is presented. Events with hadronic jets and one or two oppositely charged leptons are selected from a data sample corresponding to an integrated luminosity of 19.5 fb(-1) collected by the CMS experiment at the LHC in pp collisions at a centre-of-mass energy of 8 TeV. In order to separate the signal from the larger t (t) over bar + jets background, this analysis uses a matrix element method that assigns a probability density value to each reconstructed event under signal or background hypotheses. The ratio between the two values is used in a maximum likelihood fit to extract the signal yield. The results are presented in terms of the measured signal strength modifier, mu, relative to the standard model prediction for a Higgs boson mass of 125 GeV. The observed (expected) exclusion limit at a 95% confidence level is mu < 4.2 (3.3), corresponding to a best fit value <(mu)over cap> = 1.2(-1.5)(+1.6).
Issue Date: 
9-Jun-2015
Citation: 
European Physical Journal C. New York: Springer, v. 75, n. 251, p. 1-282, 2015.
Time Duration: 
1-28
Publisher: 
Springer
Source: 
http://link.springer.com/article/10.1140%2Fepjc%2Fs10052-015-3454-1
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/129593
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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