Measurement of jet fragmentation in PbPb and pp collisions at root s(NN)=2.76 TeV
CMS Collaboration (ukupan broj autora: 2213)
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The jet fragmentation function of inclusive jets with transverse momentum p(T) above 100 GeV/c in PbPb collisions has been measured using reconstructed charged particles with p(T) above 1 GeV/c in a cone of radius 0.3 around the jet axis. A data sample of PbPb collisions collected in 2011 at a nucleon-nucleon center-of-mass energy of root s(NN) = 2.76 TeV corresponding to an integrated luminosity of 150 mu b(-1) is used. The results for PbPb collisions as a function of collision centrality and jet transverse momentum are compared to reference distributions based on pp data collected at the same center-of-mass energy in 2013, with an integrated luminosity of 5.3 pb(-1). A centrality-dependent modification of the fragmentation function is found. For the most central collisions, a significant enhancement is observed in the PbPb/pp fragmentation function ratio for charged particles with p(T) less than 3 GeV/c. This enhancement is observed for all jet p(T) bins studied.
Извор:Physical Review C, 2014, 90, 2
- Austrian Federal Ministry of Science, Research, and Economy, Austrian Science Fund, Belgian Fonds de la Recherche Scientifique, Fonds voor Wetenschappelijk Onderzoek, Brazilian funding agency CNPq, Brazilian funding agency CAPES, Brazilian funding agency FAPERJ, Brazilian funding agency 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 and the Croatian Science Foundation, Research Promotion Foundation, Ministry of Education and Research, Estonian Research Council, Cyprus [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, Commissariat a lEnergie 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 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, Istituto Nazionale di Fisica Nucleare, Italy, Korean Ministry of Education, Science and Technology, World Class University program of NRF, Republic of Korea, Lithuanian Academy of Sciences, Ministry of Education and University of Malaya (Malaysia), Mexican funding agency CINVESTAV the Ministry of Business, Innovation and Employment, New Zealand, Mexican funding agency, CONACYT the Ministry of Business, Innovation and Employment, New Zealand, Mexican funding agency, SEP the Ministry of Business, Innovation and Employment, New Zealand, Mexican funding agency, UASLP-FAI the Ministry of Business, Innovation and Employment, New Zealand, Pakistan Atomic Energy Commission, Ministry of Science and Higher Education and the 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, Swiss funding agency ETH Board, Swiss funding agency, ETH Zurich, Swiss funding agency, PSI, Swiss funding agency, SNF, Swiss funding agency, UniZH, Swiss funding agency, Canton Zurich, Swiss funding agency, 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 and the European Research Council, EPLANET (European Union), Leventis Foundation, A.P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Federal Science Policy Office, Fonds pour la Formationa 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 Foundation for Polish Science - European Union, Regional Development Fund, Compagnia di San Paolo (Torino), EU-ESF, Greek NSRF