Charged particle multiplicities in pp interactions at root s=0:9, 2:36, and 7 TeV
CMS Collaboration (ukupan broj autora: 2151)
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Measurements of primary charged hadron multiplicity distributions are presented for non-single-diffractive events in proton-proton collisions at centre-of-mass energies of root s = 0.9, 2.36, and 7 TeV, in five pseudorapidity ranges from vertical bar eta vertical bar LT 0.5 to vertical bar eta vertical bar LT 2.4. The data were collected with the minimum-bias trigger of the CMS experiment during the LHC commissioning runs in 2009 and the 7 TeV run in 2010. The multiplicity distribution at root s - 0.9 TeV is in agreement with previous measurements. At higher energies the increase of the mean multiplicity with root s is underestimated by most event generators. The average transverse momentum as a function of the multiplicity is also presented. The measurement of higher-order moments of the multiplicity distribution con firms the violation of Koba-Nielsen-Olesen scaling that has been observed at lower energies.
Кључне речи:Hadron-Hadron Scattering
Извор:Journal of High Energy Physics, 2011, 1
- 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, and National Natural Science Foundation of China, Colombian Funding Agency (COLCIENCIAS), Croatian Ministry of Science, Education and Sport, Research Promotion Foundation, Cyprus, Estonian Academy of Sciences and NICPB, Academy of Finland, Finnish Ministry of Education, and Helsinki Institute of Physics, Institut National de Physique Nucleaire et de Physique des Particules / CNRS, and Commissariat a lEnergie Atomique, France, Bundesministerium fur Bildung und Forschung, Deutsche Forschungsgemeinschaft, and Helmholtz-Gemeinschaft Deutscher Forschungszentren, Germa-ny, General Secretariat for Research and Technology, Greece, National Scientific Research Foundation, and National Office for Research and Technology, Hungary, Department of Atomic Energy, and 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, and 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, and Turkish Atomic Energy Authority, Science and Technology Facilities Council, U. K., US Department of Energy, US National Science Foundation, European Research Council (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), Marie-Curie programme