First measurement of the underlying event activity at the LHC with root s=0.9 TeV
CMS Collaboration (ukupan broj autora: 2079)
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A measurement of the underlying activity in scattering processes with p (T) scale in the GeV region is performed in proton-proton collisions at root s = 0.9 TeV, using data collected by the CMS experiment at the LHC. Charged particle production is studied with reference to the direction of a leading object, either a charged particle or a set of charged particles forming a jet. Predictions of several QCD-inspired models as implemented in PYTHIA are compared, after full detector simulation, to the data. The models generally predict too little production of charged particles with pseudorapidity |eta| LT 2, p (T) GT 0.5 GeV/c, and azimuthal direction transverse to that of the leading object.
Извор:European Physical Journal C. Particles and Fields, 2010, 70, 3, 555-572
- Austrian Federal Ministry of Science and Research, Belgium 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, National Natural Science Foundation of China, Colombian Funding Agency (COLCIEN-CIAS), Croatian Ministry of Science, Education and Sport, Research Promotion Foundation, Cyprus, Estonian Academy of Sciences, NICPB, Academy of Finland, Finnish Ministry of Education, Helsinki Institute of Physics, Institut National de Physique Nucleaire et de Physique des Particules/CNRS, Commissariat a lEnergie Atomique, France, Bundesministerium fur Bildung und Forschung, Deutsche Forschungsgemeinschaft, Helmholtz-Gemeinschaft Deutscher For-schungszentren, Germany, General Secretariat for Research and Technology, Greece, National Scientific Research Foundation, Hungary, National Office for Research and Technology, 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, Korean Ministry of Education, Science and Technology, World Class University program of NRF, Korea, Lithuanian Academy of Sciences, Mexican Funding Agencies (CINVESTAV, CONACYT, SEP, and UASLP-FAI), Pakistan Atomic Energy Commission, State Commission for Scientific Research, Poland, Fundacao para a Ciencia e a Tecnologia, Portugal, JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan), Ministry of Science and Technologies of the Russian Federation, Russian Ministry of Atomic Energy, Ministry of Science and Technological Development of Serbia, Ministerio de Ciencia e Innovacion, Spain, Swiss Funding Agencies (ETH Board, ETH Zurich, PSI, SNF, UniZH, Canton Zurich, and SER), National Science Council, Taipei, Scientific and Technical Research Council of Turkey, Turkish Atomic Energy Authority, Science and Technology Facilities Council, UK, US Department of Energy, US National Science Foundation, European Union, Leventis Foundation, A.P. Sloan Foundation, Alexander von Humboldt Foundation, Associazione per lo Sviluppo Scientifico e Tecnologico del Piemonte (Italy), 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)
ISSN: 1434-6044 (print); 1434-6052 (electronic)