Measurements of the t(t)over-bar production cross section in lepton plus jets final states in pp collisions at 8 and ratio of 8 to 7 cross sections
CMS Collaboration (ukupan broj autora: 2310)
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A measurement of the top quark pair production () cross section in proton-proton collisions at the centre-of-mass energy of 8 is presented using data collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.6. This analysis is performed in the decay channels with one isolated, high transverse momentum electron or muon and at least four jets, at least one of which is required to be identified as originating from hadronization of a b quark. The calibration of the jet energy scale and the efficiency of b jet identification are determined from data. The measured cross section is . This measurement is compared with an analysis of 7 data, corresponding to an integrated luminosity of 5.0, to determine the ratio of 8 to 7 cross sections, which is found to be . The measurements are in agreement with QCD predictions up to next-to-next-to-leading order.
Izvor:European Physical Journal C. Particles and Fields, 2017, 77, 1, 1-27
- Austrian Federal Ministry of Science, Research and Economy and the Austrian Science Fund, Belgian Fonds de la Recherche Scientifique, and Fonds voor Wetenschappelijk Onderzoek, Brazilian Funding Agencies (CNPq, CAPES, FAPERJ, and FAPESP), Bulgarian Ministry of Education and Science, CERN, Chinese Academy of Sciences, Ministry of Science and Technology, and National Natural Science Foundation of China, Colombian Funding Agency (COLCIENCIAS), Croatian Ministry of Science, Education and Sport, and the 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, and Helsinki Institute of Physics, Institut National de Physique Nucleaire et de Physique des Particules / CNRS, and Commissariat lIEnergie Atomique et Energies Alternatives / CEA, France, Bundesministerium fur Bildung und Forschung, Deutsche Forschungsgemeinschaft, and Helmholtz-Gemeinschaft Deutscher Forschungszentren, Germany, General Secretariat for Research and Technology, Greece, National Scientific Research Foundation, and National Innovation Office, Hungary, Department of Atomic Energy and the Department of Science and Technology, India, Institute for Studies in Theoretical Physics and Mathematics, Iran, Science Foundation, Ireland, the Istituto Nazionale di Fisica Nucleare, Italy, Ministry of Science, ICT and Future Planning, and National Research Foundation (NRF), Republic of Korea, Lithuanian Academy of Sciences, Ministry of Education, and University of Malaya (Malaysia), Mexican Funding Agencies (CINVESTAV, CONACYT, SEP, and UASLP-FAI), Ministry of Business, Innovation and Employment, New Zealand, Pakistan Atomic Energy Commission, the Ministry of Science and Higher Education and the National Science Centre, Poland, Fundacao para a Ciencia e a Tecnologia, Portugal, JINR, Dubna, Secretaria de Estado de Investigacion, Desarrollo e Innovacion and Programa Consolider-Ingenio 2010, Spain, Swiss Funding Agencies (ETH Board, ETH Zurich, PSI, SNF, UniZH, Canton Zurich, and SER), the Ministry of Science and Technology, Taipei, Thailand Center of Excellence in Physics, the Institute for the Promotion of Teaching Science and Technology of Thailand, Special Task Force for Activating Research and the National Science and Technology Development Agency of Thailand, Scientific and Technical Research Council of Turkey, and Turkish Atomic Energy Authority, National Academy of Sciences of Ukraine, and State Fund for Fundamental Researches, Ukraine, Science and Technology Facilities Council, UK, US Department of Energy, and the US National Science Foundation. Individuals have received support from the Marie-Curie programme and the European Research Council and EPLANET (European Union), Leventis Foundation, the A. P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Federal Science Policy Office, Fonds pour la Formation la Recherche dans lIndustrie et dans lAgriculture (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 the Foundation for Polish Science, cofinanced from European Union, Regional Development Fund, Compagnia di San Paolo (Torino), Consorzio per la Fisica (Trieste), MIUR project [20108T4XTM], Thalis and Aristeia programmes cofinanced by EU-ESF and the Greek NSRF, National Priorities Research Program by Qatar National Research Fund, Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University (Thailand), Welch Foundation