Measurement of top quark polarisation in t-channel single top quark production
CMS Collaboration (ukupan broj autora: 2300)
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A first measurement of the top quark spin asymmetry, sensitive to the top quark polarisation, in t-channel single top quark production is presented. It is based on a sample of pp collisions at a centre-of-mass energy of 8TeV corresponding to an integrated luminosity of 19.7 fb(-1). A high-purity sample of t-channel single top quark events with an isolated muon is selected. Signal and background components are estimated using a fit to data. A differential cross section measurement, corrected for detector effects, of an angular observable sensitive to the top quark polarisation is performed. The differential distribution is used to extract a top quark spin asymmetry of 0.26 +/- 0.03(stat) +/- 0.10(syst), which is compatible with a p-value of 4.6% with the standard model prediction of 0.44.
Кључне речи:Hadron-Hadron scattering (experiments) / Top physics
Извор:Journal of High Energy Physics, 2016, 4
- Austrian Federal Ministry of Science, Research and Economy, Austrian Science Fund, Belgian Fonds de la Recherche Scientifique, Fonds voor Wetenschappelijk Onderzoek, CNPq, CAPES, FAPERJ, 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, Estonia, Estonian Research Council, Estonia [IUT23-4, IUT23-6], 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, France, Commissariat a lEnergie Atomique et aux Energies Alternatives / CEA, France, Bundesministerium fur Bildung und Forschung, Germany, Deutsche Forschungsgemeinschaft, Germany, Helmholtz-Gemeinschaft Deutscher Forschungszentren, Germany, General Secretariat for Research and Technology, Greece, National Scientific Research Foundation, Hungary, National Innovation Office, Hungary, Department of Atomic Energy, India, 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, Republic of Korea, National Research Foundation (NRF), Republic of Korea, Lithuanian Academy of Sciences, Ministry of Education (Malaysia), CINVESTAV, CONACYT, SEP, UASLP-FAI, Ministry of Business, Innovation and Employment, New Zealand, Pakistan Atomic Energy Commission, Ministry of Science and Higher Education, Poland, 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, Spain, 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, U.K., US Department of Energy, US National Science Foundation, Marie-Curie programme (European Union), European Research Council (European Union), 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 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, European Union, Regional Development Fund, OPUS programme of the National Science Center (Poland), Compagnia di San Paolo (Torino), MIUR (Italy) [20108T4XTM], Thalis programme - EU-ESF, Aristeia programme - EU-ESF, Greek NSRF, National Priorities Research Program by Qatar National Research Fund, Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University (Thailand), Welch Foundation [C-1845], University of Malaya (Malaysia)